My pup does that
He's 9 weeks old tomorrow. The second he gets close he pounces too. He doesn't bite anymore because I was able to teach him "OFF." He's still learning but he's getting the hang of it. Anyway I've never had a puppy do that to me either.
But he loves it so i just let him do it. No aggression but he gets real excited when I play along with him. So I'm sure it's the same with yours.