I don't get why you don't just rename the whole tag Butch
and be done with it. I really don't see the point in differentiating it. Tomboy in general is kind of derogatory imo, it implies their masculinity is just a childish trait they'll grow out of. It's also not a word I think I've ever seen used on someone over the age of like, 13? So it feels very immature to me. Just say butch, it's so much easier.