The psychological power of language can't be understated, one big part of why a lot of young women feel the need to take on the cultural and physical role of a transmasc is because there's not a non-medical counterpart that exists, which allows them to have ownership and conviction in their identities. Males have "femboy", but you cannot act like "tomboy" is a real significant equivalent, because it isn't. It doesn't have the same level of differentiation, of autonomy, or gender critical culture backing it up, "tomboy" is literally just a soft label, a flavor of woman that's still connected to the partisan gender demiurge. And on top of that, it's something that's associated with a forced contrarian attitude, i.e. "not like other girls" to the point where it's considered taboo or obnoxious to adopt it as a label. So no shit there's not a lot of young women adopting this label, and not to mention that the concept of "tomboy" is heavily intertwined with youth (boy is literally in the name), and it reinforces Peter Pan Syndrome. But if there was a counterpart to femboy that allowed for differentiation that was modernly born do you really think so many people would be obsessed with medical transition? In a sense, semantically, you could argue that this IS what social (i.e. non-medical) transitioners ARE.
The solution obviously is to remember that letting language inform your perception of reality is flawed, but it's not as though this isn't an elephant in the room that rarely gets addressed
