Well, what about if my male is looking kinda skinny?

Hes not necessarily scrawny, his tail looks plump. But he doesnt look as "big" as most of the adult leos that i have seen on Youtube and in pictures. (The leos i see online are not of "giant/supergiant" morph)

MY leo is 1.7 years old. That should be a full grown animal right?

Does this mean i should fatten him up with some pinkies?