Hi there, those last two are definitely not Crèvecoeurs. They are pretty though! That one has nice double lacing on its feathers.
On a real Crèvecoeur, you would see all black feathers, no gold laced feathers at all. Sometimes with a single white feather or two on the back of the head, which is considered a fault in exhibition.
Also, the comb should be in a "V" shape.
It looks like your second bird has either a rose comb or a kind of squashy single comb, and the rooster in the bottom picture definitely has a single comb (normal shaped chicken comb).
Also, I can't tell for sure, but it looks like your black hen might have feathers on her legs?
My guess is that they are silkie crosses. This would explain the crests and beards, rose comb, and leg feathering (if that's what I'm seeing and it's not just the hen's shadow!) If any of them has 5 toes, or if the skin around their vent is kind of grey in color instead of pink... that would confirm it.
Best regards, exop