What kind of chickens are these? (several pics)

[dangerouschicken]

You are right! Those are some Cornish Xs. The hen has that "look" about her.

 

[bigzio]

Yep, I agree that they are cornishX, the meat birds.

They won't have longevity if that is the case, so it's a good idea to keep that in mind.

bigzio

 

[RobinEgg]

I don't think they are rocks, I have barred rocks and 1 white rock pullet , they don't have combs like these and my leghorn roos have a slimmer build. I vote cornish x