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Yes, it might be possible. The egg would have to be fertile, but some store eggs are. And as you discovered, at least some refrigerated eggs can hatch.

It is not a White Leghorn, because there are no Leghorns on the list of possible parents. I think it might be male. That would partly explain the body being thicker & heavier. Other than that, I don't what what specific genes from which parents caused that effect. I think that comb is...