The name Turken is an old one, and a misnomer, just because of their looks. You cannot cross a duck and chicken, either. If you want a cross between two differnt species, one being a chicken, the only thing I have heard of being succesful is a phesant and a chicken, or a guinea and a chicken. The only successful mating was between turkeys and Rhode Island Reds. I have seen no other papers on any other successful hybridizations between the two species.
Guineas are about as distantly related to chickens as turkeys are.
Ducks are very different from chickens. They are different orders. This just means that they are so different that hybrids are very unlikely to be possible. It would be like crossing a cat to a dog. This is a private posting area.