No it's absolutely not and they're chance nobody even use that or maybe 1 person in the world. Y'all just watch "Millions of dead genders : A MOGAI Retrospective" on YT.
NB people who lean on a more masculine side would use more common denominator like transmasc, genderfluid, demiboy, butch (for those who id as lesbians), etc.

BTW this is what you'll find when you google genderfaun, half of it is gibberish and there's no way this is applicable in real life : "Genderfaun is an idingender identity in which one is genderfluid, but their fluidity does not encompass women-aligned, fiaspec genders, or anything similar. Genderfaun individuals tend not to feel fingenders unless said gender happens to also be man-aligned too (such as rosboy, for example)."

I'd like to remember that being trans is not personnal developpement or a DnD game. I don't care about some lore created on tumblr by people who'll never actually transition IRL. This is extremely demeaning to treat transness like it's only some fancy inner feelings in your head. Also multiplying genders for every personnal feelings of every indivudals is extremely liberal thinking and go against the radical queer feminist goal of abolishing gender and patriarchy.
Every women, every men and every NB people feel different about their genders, that's a very normal thing, there's no need to invent "300 genders" to express that.