The black chicks look like Rosecomb bantams to me. My late Rosecomb looked like them when she was young.
EDIT: Never mind, I can see that two of them have single combs. Maybe the chick in photo number two is a Rosecomb though.
EDIT: Never mind, I can see that two of them have single combs. Maybe the chick in photo number two is a Rosecomb though.