The second photo and the one on the right of the bottom photo is a boy. The other likely is too but I can't tell for sure. Rose combs are the only babies I will buy at a swap or something because I can spot gender on them easily.
I bought two pullets last year from a swap, the girls have a thinner comb, while the boys are already broadening out to make room for a really wide rose comb. Normal for girls to have black spots on the comb, and a duller appearance. That wide bright yellow band of a comb though... that's a boy. With some pink in it already too.