U džepu sam našla dovoljno sitniša za kavu i novine.

Croatian word order is quite flexible. Starting with U džepu puts the location first for emphasis: In my pocket, I found...

A more neutral order would be something like:

• Našla sam u džepu dovoljno sitniša za kavu i novine.

But U džepu sam našla... sounds very natural and highlights where the money was found.

Džepu is in the locative singular.

The basic noun is džep = pocket.
After u when it means in / inside, Croatian normally uses the locative:

• u džepu = in the pocket

Compare:

• u kući = in the house
• u gradu = in the city
• u džepu = in the pocket

Sam našla is the Croatian past tense.

Croatian past tense is usually made with:

• a present form of biti = to be
• plus the past participle

So:

• sam našla = I found

Here:

• sam = auxiliary for I
• našla = past participle of naći / naći? More precisely, from naći = to find

In everyday Croatian, this is the normal way to say I found in the past.

Because the speaker is female.

In Croatian past tense, the participle agrees with the gender of the subject:

• našao sam = I found (male speaker)
• našla sam = I found (female speaker)

So this sentence tells you that the person speaking is a woman.

Croatian has a rule that short unstressed words, called clitics, usually go in the second position in the sentence or clause.

That is why you get:

• U džepu sam našla...

Here sam comes after the first phrase U džepu.

This is very typical in Croatian. You will often see:

• Jučer sam došla.
• Kod kuće smo jeli.
• U džepu sam našla...

Dovoljno means enough.

In this sentence it modifies the amount of money/change found:

• dovoljno sitniša = enough change

A very important pattern is:

• dovoljno + genitive

So Croatian says literally something like:

• enough of change

Other examples:

• dovoljno vremena = enough time
• dovoljno novca = enough money
• dovoljno hrane = enough food

Sitniša is the genitive singular of sitniš.

Sitniš means small change / coins / loose change.
Because it follows dovoljno, it goes into the genitive:

• dovoljno sitniša = enough change

This is a very common pattern with quantity words.

The preposition za here means for in the sense of enough for buying / paying for something.

After za, Croatian uses the accusative in this meaning:

• za kavu = for coffee
• za novine = for newspapers / for the newspaper

So the phrase means:

• enough change for coffee and a newspaper

Because kavu is the accusative singular of kava.

The base form is:

• kava = coffee

After za, you need accusative:

• za kavu = for coffee

This is a very common feminine noun pattern:

• voda → vodu
• knjiga → knjigu
• kava → kavu

Yes, novine is grammatically plural, but it often means newspaper in Croatian.

This is one of those nouns that are plural in form even when the meaning in English may be singular:

• novine = newspaper / newspapers

In this sentence, za kavu i novine usually means for a coffee and a newspaper.

Because novine is plural in form, the accusative plural is also novine, so it looks the same as the dictionary form.

No, not in the Croatian sentence.

U džepu literally means in the pocket, but in context it is naturally understood as in my pocket because the speaker is talking about what she found.

Croatian often leaves out possessives when they are obvious from context, especially with body parts, clothing, and personal belongings.

So:

• U džepu sam našla...
  can naturally mean
• I found ... in my pocket

Yes, depending on context.

Sitniš is usually best translated as:

• change
• loose change
• small coins

So dovoljno sitniša can mean:

• enough change
• enough loose change
• enough small coins

The most natural English version is often enough change.

A simple breakdown is:

• U džepu = in the pocket / in my pocket
• sam našla = I found (female speaker)
• dovoljno sitniša = enough change
• za kavu i novine = for coffee and a newspaper

So the structure is basically:

• location + past tense verb + quantity phrase + purpose/use phrase

That makes the sentence feel very natural and idiomatic in Croatian.