Looks like he's got a split comb, like a single comb mixed with a rose comb. Some breeds of chooks that are supposed to be single comb occasionally throw rosecombs, but he looks like he got stuck in the middle of the two, lol. Definitely not according to breed standard as far as I know. You couldn't pass him off as either single comb or rose comb.
I breed mongrels and there is no limit it seems to the amount of different comb types and mutations you can get. He's got a rather tidy variation there, should look quite interesting when he grows up.
Best wishes.