No. Layers are layers and broilers are meat birds
Yes. In order to call them chicken legs, they must come from a chicken.
no it is not chicken guts are insides of chickens
"Dressed" (referring to fowl) means simply "ready for the oven". Cleaned, plucked, innards removed, washed, etc.
Well, chickens are carnivorous, they eat bugs worms and have even been known to eat rats. Yes you heard right, rats! So you could theoretically feed them chicken meat, but that just seems, well.......