now that someone mentioned being dubbed they do appear that way. they might be pure breed games or mixed games (one game breed to a different game breed to me is a mutt game)
they could be fighting game hens, as they look like some we have and thats what a judge called it. i would do more research and at least a month of isoltaion before introducing to an established flock as they could have some type of health problem. they really look like mutts and i wouldnt breed...