Umm... all these chickens look like barnyard EEs to me.
Nobody really looks Polish to me. No pluffs, no plooms--
The closest is the one drinking- that one has a little tuft- but... (shrugs)... Some Eggers have tufts, too.
The black one, walking in, that's a cockerel. He has saddle feathers already and has a plump comb.
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This picture has at least 2 cockerels in it.
I am thinking it is of the one that went inside, closest to the water, and the other cockerel is the on closest to you- You can see the rust color breaking thru on his wings and I'll bet he has saddles and hackles that are spiky- but this picture isn't clear to me.
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The red chicken doesn't scream cockerel to me- per say. There's no plumping compared to the black on and I can't make out any clear cockerel feathering.
The other chickens are blurry and smooshed together. That makes it harder to tell- but- IS more pullet behavior
Polish chickens are notorious for being slow developers and harder to gender than many other breeds. If your's do have that in the tree, you may have sneaky cockerels who don't let know til you REALLY know

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They are pretty birds and I hope you are able to get the answers you were looking for.