Thanks for the help! I think you are right about the first two. I never heard of Anconas, but when I looked them up, the pictures do look the same.
I'll have to get a more recent picture of the yellow one. The chicks belong to my daughter, soo I am not sure if the big yellow one is really big, or, if the little ones are Anconas, that is a small breed, so that would make the chicks a little smaller than others?