they all look like mix breeds, the ones with the peas combs and fluffy faces look like they have easter egger in them, the others look like mixes also. Very cute chicks tho!
The only one that I think is a pullet is the reddish one in the 2nd pic. The white might be but I'm leaning more toward roo on that one. The other three I think are roos. They are all mix breeds. The black one has other colors coming in over its shoulders so that would rule out pure Australorp or Jersey Giant.