The first one might be an Orpington that just doesn't have the right type of comb. Different combs can crop up in breeds. For example, some Wyandottes are single combed. The white one looks like an Orpington mix, as the legs should be white, not green. As Kelsie2290 suggested, she might have some Easter Egger in her. The third one looks like it could also be a White Orpington mix. And, lastly, the fourth bird is a Dark Cornish hen, purebred.