Number 2 is the only one I would say for sure is a cockerel. Three to five appear to be hens. I'm slightly leaning toward cockerel on number 1, but I wouldn't give up on it yet.
They all look like pullets to me, but keep an eye on #2. I agree, combs should be much bigger, and you can see the hackles of the first two, they arent very sharp. Though #2 has a redder comb and more earlobe/wattle development