Like a Boss? :O
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It's never really been stated one way or the other. Like Hlev said, in DBO a bald character gets a ssj mohawk, and since those characters and designs were done by AT, I would have to consider them canon.. Gohan's hair did appear to get longer at the Tenkaichi Budokai, as well as more defined with more 'locks'. Outside of those and of course Cell Games Gohan however, it doesn't seem to really grow for ssj2. More definition sure, but no real change in overall length.