Is it normal and or healthy for a 13 yo teen male to masturbate daily non-stop? if not, what methods can he use to prevent masturbating often?

No health problems from him doing that. If indeed it is "non-stop" as you claim, where he doesn't go to school, eat, or do anything else from wake to sleep, that is not normal. On the other hand, if it's just often and he is doing this in private, then you just need to chill. His awareness of his newfound sexuality will wear off in a few months , and you just need to step back. It's his body...