LolThese birds have pea combs, beards, and clean slate legs. I'll bet the Cochin is actually a Brahma mix and he didn't sire these.
None of the breeds mentioned have slate legs or pea combs (except for Brahma for the combs). The person you got them from doesn't know what they have. To me they seem like Ameraucana mixes.
Pretty good guesses. They're on it