Once they are old enough that the cockerels' combs and wattles start to grow more than the pullets, yes. In my LIMITED experience, a female chick of a given breed may grow a bit faster than another and their comb might be a BIT bigger, maybe a little pink especially after exertion but those 2 birds @NanaNeen posted clearly have much larger combs and wattles. If there was a side shot of them I would think the hackle and saddle feathers would also be telling. I don't know what breed her birds are but POSSIBLY White Rocks. If so, the combs on my 1 Y/O WR hens isn't even close to those of the suspected males she posted.