If the barred one has yellow skin, the yes is barred rock. If it has white skin, is more likely Cuckoo marans. Comb size is a mite concerning, but no wattles to go with it, so...give it more time.
The red and white one is popping a crest, is NOT a cream legbar, and no idea what it is.
Of the other 2, 1 is definitely getting a crest, colors are pretty close, so legbar is possible. The other looks just like it, could be behind on the crest, or not get at all. Could be something else, could be not crested legbar.
Gender: they look like are 3-4 weeks, so too early to tell for certain.