My freshman son is 15. He is 5'5", 95 pounds.
We are a class C school that plays 8 man football. I had to tell the coach that he is not to play varsity ball this year. Really hoping for that growth spurt.
BTW, there is no chance that he will play CFB. I'd say your son is much better equipped for that role. Just get him to BYU!
FWIW, our hs principal is Scott Gragg, who was an offensive tackle for the Giants and 49ers.