We have four 4 week old polish chicks, there are 2 very different "hair styles" developing, but am at a total loss for gender. Three have a 'fro, one has a mowhawk.
comparison
I too have 23 of these little buggers! and can't tell what is what. I also have two pair that are all white with feathered legs, one silver and one rusty brown with a cross beak! all came from MM. Most of mine look like the one you posted, black with white and black tophats.