They look like mixes to me. The first chick has 5 toes on at least one foot which would lead to dorking or faverolles, but it has the looks of a production red or gold comet.
The striped chick has the legfuzz of a cochin, faverolles, or sultan, but no other feature of those breeds. I also see a muff on it, which would lead me to a d'uccle or faverolles cross.
The black chick is some sort of barred cross.
They are adorable, it'll be interesting to see how they turn out!