Learn Portuguese (Portugal): Não, compreendemos pouco.

In this sentence, pouco is acting as an adverb of degree describing how much we understand. When words like pouco (little) or muito (a lot) are used as adverbs modifying a verb, they are invariable. This means they stay in this default masculine singular form and never change, no matter who is doing the action.

Why is there no word for "we" in the Portuguese sentence?

In Portuguese, it is very common to leave out subject pronouns like nós (we). The verb ending does the work of telling you who is acting. The -emos ending on the verb compreendemos makes it completely clear that "we" are the ones who understand.

Is "compreendemos" a regular verb?

Yes, it comes from the regular verb compreender (to understand). Verbs that end in -er in their dictionary form always use the -emos ending for the "we" form in the present tense.

Can I put "pouco" before the verb instead?

Usually, no. When adverbs of degree like pouco (little) or muito (much) modify a verb, they are placed right after that verb. This is why the natural word order is compreendemos pouco.