IT is a very large comb but isn't very pink. I was also thinking a roo but the tail reminds me more of a pullet. Having said all of that, I'm inexperienced and I would trust speckled hen or just wait until it crows or lays an egg.
I'm honestly not sure. That's a lot of comb for a 10 week old BO, but at the same time the waddles are small and not very red. The body shape DOES look rooish to me, though.
This is my guy at 13 weeks. Take that as you will.