They are a hybrid, so no, they cannot be exhibited.
Edit: In light of further replies, I will change my phrasing: they SHOULDN'T be exhibited. Yes, you could show them, because county fairs often have little to no judging standards, and you might even win, but it wouldn't be any different than having your bird's names picked out of a hat. There's not really much point to it, in my opinion. With that said, if you acknowledge that the whole thing is rather irrelevant, and you still want to enter them for fun, I doubt anyone would stop you.