Thanks for the replies.
I don't think they are California Whites. They look different. I don't know about the Ross or Cobbs. Here are some pics. Tell me what you think.
The first one has only yellowish/light brownish feathers under the white ones. The second one has the obvious brown...
I got some Rhode Island Reds and what looked to be white leghorns as chicks. Now, at 8 weeks old, the white chickens are actually bigger than the RIR's and a couple of them have some random black feathers mixed with the white on their backs. The fact that they are bigger than the RIR's makes...