Not sure if this helps, but I breed white crested black Polish, and if this chick was completely black when he was born, then he most likely is Crevecoeur. White crested blacks are not completely black when born.
My friend owns these 2. I'm pretty sure the Wyandotte is a cockerel, but I want confirmation. The other is an Americana, which I have no clue. Both are 2 months old.
I need to be 100% sure of what these 3 are. They are all 4 months old & look completely different. Cockerels or pullets? The first & second pics are the same 2 & the third & fourth pics are of the one I think is a female. I say think, because the comb & wattles never developed.
I bought 6 chickens that were supposed to be pullets, however, I think most may not be. So I'm asking the experts since I'm a chicken newbie. These 3 I'm not sure of.