What are these little guys?

Just adopted them from the shelter where I work at. They were found besides the road somewhere. No feathers on their legs. Pretty sure we have 2 hens and one may be a rooster. Are they meat chicks? And if so, could we still keep them as pets with the right care? I'm suspecting them to be meat chicks since they look larger while still in fluff compared to the leghorns we've had before. We're currently setting up their cage with a heatlamp.