cockerel and looks to have a rose comb making it a dom and not a barred rock plus the pattern looks to be more of the cuckoo pattern rather than straight on barring
no those are not frizzles but would be perfect for breeding. when breeding you always use a smooth feathered bird and a frizzled bird. you will get a 50/50 split with half being frizzled and the other half with normal feathering. if...
the crested ones have pullet coloring but the mottled one I would watch should be another week or 2 and you should know for sure based on feather development