golden laced Wyandotte's help
They are definitely developing single combs rather than rose (single combs do occur in wyandottes, though it is outside the standard, recessive and generally culled from serious breeding programs)- and considering the leg color in that last photo they are not GLW. They may be BSL (black sex links) with a LOT of leakage, or they could be a different breed. Where were they purchased?
I agree with Ol Grey Mare. They definitely aren't GLW's.