? about different combs on my ameraucana's

[East Tennessee Lisa]

I have 3 ameraucana's chicks and two have the same pea looking comb but the other one has a very different comb. It looks to be a single comb. Is that possible? Is it a mixed or cross breed? All the pictures I've seen they have a pea comb anybody know different?

pea comb

Single comb?

I was given an ameraucana rooster... and he is wonderful, but he has a single comb. Not sure if he is fully ameraucana now.

 

[The Moonshiner]

I was given an ameraucana rooster... and he is wonderful, but he has a single comb. Not sure if he is fully ameraucana now.

If he has a single comb he's not.
Single is also recessive to pea which means both parents weren't true Ameraucana either.