Well from those pics it is hard to tell (not because they don't want to calm down). THe white one (leghorn?) and the black (Australorp?) look like they just may turn out to be boys...combs are getting big at this age to be girls. THe other which looks to be a Red Star or perhaps an orpington...still looks like a girl. Only sure way to know is when they get old enough to grow pointy saddle feathers which will be around 3-4 mos of age. Then you will have your answer. I have had girls bully each other by chest bumping and I have heard others say they had a crower which turned out to be a hen. Hang in there....time will tell. Sounds like you are enjoying their antics which is the best part of having chickens! Give them some watermelon....they go crazy.