One of the chicks in the last pic has a single comb, looks like to me. And it appears to be a Speckled Sussex. Check the combs on them. Are they all spikey (single combs) or do any have the flattish pea type comb?
In any case, there are no Ameraucanas in the group; maybe an Easter Egger if one has a pea type comb, though EEs don't have a standard so on occasion will have a single or a combination pea/single looking comb.
The black one--can't see the comb on that one. What type does it have?