No bank in the USA will convert coins to US dollars. Where can I convert these polish coins to us dollars?
Nowhere. As money, they are worthless, and no bank anywhere will redeem them for you. As collector's items, that depends on what a collector will pay for them. Might be practically nothing, or might be something substantial, depending on the nature of the collection. You'll have to do your research and shop around for an interested buyer. Most likely, they have only sentimental value, in which case they would make a good gift for a young person who is interested in coin collecting.