Technically anabolic steroids will cause his calves to grow as they’d cause anyones calves to grow (with or without training if dose is high enough), anabolic steroids (when dosed high enough) put the body in a consistently anabolic state, being in an anabolic state means you will build lean tissue, how much is irrelevant, but to say nothing will happen if you take steroids and don’t train simply isn’t true, while it’s a fucking stupid idea as you’ll gain maybe 1/4th of what you could with AAS+training, it’ll do something.
Anyway, I’ll chime in here, growth potential of you’re calves will depend on
- insertions (tendon and muscle)
- ratio of type I/II fibres in said area ( and subtypes of type II fibres )
- androgen receptor density in said muscle group
- genetic response to nutrition
Finally, you’re calves may look small despite measuring large on tape due to shitty insertions, you might have 19 inch calves but the dude next to you whose calf MUSCLES literally go down to his ankles, therefore he can’t wear boots, has bigger looking calves with 14 in calves.
It’s like triceps, there are guys who are even smaller than I am, yet have far more aesthetic looking arms, lateral head of their tricep POPs, full, thick long head and dense medial head, these guys will have bigger looking triceps at 14 inches in circumference than I would at 17 inches (although upon flexion of arms it’s very obvious the difference between 14-17inches, no amount of genetics, presuming same height and leverages, can make the illusion of 3 inches in arm size when flexed)