W zamrażarce mam zapas warzyw na zupę.

Because w means in here, and when Polish uses w to talk about a location, the following noun usually goes into the locative case.

• dictionary form: zamrażarka = freezer
• locative singular: zamrażarce = in the freezer

So:

• w zamrażarce = in the freezer

This is a very common pattern:

• w domu = in the house / at home
• w sklepie = in the shop
• w lodówce = in the fridge
• w zamrażarce = in the freezer

Zamrażarka means freezer.

Depending on context, it can mean:

• a separate freezer appliance
• the freezer section of a fridge-freezer

So w zamrażarce is simply in the freezer.

A related word you may also see is lodówka = fridge.

The subject is built into the verb mam.

• mam = I have

In Polish, subject pronouns are often omitted when the verb already makes the person clear.

So:

• mam = I have
• ja mam = I have

Both are possible, but ja is often unnecessary unless you want emphasis or contrast.

For example:

• Mam zapas warzyw. = I have a stock of vegetables.
• Ja mam zapas warzyw, a on nie. = I have a stock of vegetables, but he doesn’t.

Zapas means supply, stock, or reserve.

In this sentence, mam zapas warzyw means something like:

• I have a stock of vegetables
• I have a supply of vegetables
• I keep vegetables in reserve

It does not necessarily mean one specific package. It suggests that there is enough stored for future use.

Other examples:

• zapas jedzenia = a supply of food
• zapas wody = a supply of water
• zapas czasu = extra time / time in reserve

Because after zapas, Polish normally uses the genitive to show a supply of something.

• warzywa = vegetables (basic nominative/accusative plural form)
• warzyw = of vegetables (genitive plural)

So:

• zapas warzyw = a supply/stock of vegetables

This is a very common structure in Polish:

• dużo warzyw = a lot of vegetables
• mało czasu = little time
• kilogram jabłek = a kilogram of apples
• zapas warzyw = a stock of vegetables

The base form is warzywa.

A few useful forms are:

• warzywa = vegetables
• warzyw = of vegetables

So in the sentence:

• zapas warzyw = stock of vegetables

Note that warzywa is plural in meaning, and it is the normal dictionary form you would learn for vegetables.

Here na means something like for or intended for.

So:

• warzyw na zupę = vegetables for soup / vegetables intended for making soup

The noun after na is in the accusative case:

• zupa → zupę

This use of na is very common when talking about purpose, intended use, or what something will be used for.

For example:

• pieniądze na wakacje = money for a holiday
• składniki na ciasto = ingredients for a cake
• warzywa na zupę = vegetables for soup

Both can sometimes be translated as for soup, but the nuance is different.

• na zupę = for making soup, intended to be used to make soup
• do zupy = for/into the soup, as something added to the soup

In this sentence, warzywa na zupę means vegetables set aside to make soup with, so na zupę is the natural choice.

Compare:

• Kupiłem warzywa na zupę. = I bought vegetables to make soup.
• Dodałem makaron do zupy. = I added noodles to the soup.

So na points more to the planned purpose, while do often points more directly to something going into something.

Yes, both are possible.

• W zamrażarce mam zapas warzyw na zupę.
• Mam w zamrażarce zapas warzyw na zupę.

Both mean essentially the same thing, but the word order changes the emphasis a little.

W zamrażarce mam...

This puts the location first. It sounds like:

• As for the freezer, I have...
• In the freezer, I have...

This is natural if the speaker wants to focus first on where the vegetables are.

Mam w zamrażarce...

This starts with I have, which is also very natural and a bit more neutral in some contexts.

Polish word order is more flexible than English, and it often reflects emphasis, topic, or what is already known in the conversation.

Yes, it sounds natural.

W zamrażarce mam zapas warzyw na zupę. is a normal, idiomatic sentence.

It gives a sense of:

• I keep a supply of soup vegetables in the freezer.
• I have vegetables in the freezer for making soup.

It sounds like everyday spoken or written Polish.

Not necessarily.

The sentence only tells you that there is a supply of vegetables for soup in the freezer. It does not specify whether they are:

• chopped
• mixed together
• frozen in bags
• homemade or store-bought

If you wanted to be more specific, Polish could say things like:

• pokrojone warzywa na zupę = chopped vegetables for soup
• mrożone warzywa na zupę = frozen vegetables for soup
• mieszanka warzyw na zupę = a vegetable mix for soup

So the original sentence stays general.

Yes. That is completely normal.

• zapas is singular: one supply / one stock
• warzyw is plural in meaning: vegetables

So zapas warzyw literally means a supply of vegetables.

English works similarly:

• a pile of books
• a bag of apples
• a stock of vegetables

The first noun can be singular, while the second refers to many things.

A natural stress pattern depends on context, but often the important information comes near the end.

For example:

• W zamrażarce mam zapas warzyw na zupę.

If someone asks What do you have in the freezer?, the stress may fall on:

• zapas warzyw na zupę

If someone asks Where do you keep vegetables for soup?, the speaker may stress:

• w zamrażarce

So the word order helps guide the listener, but actual spoken stress depends on what is new or important in the conversation.