Femboy vs flamboyant vs softboy, and how they compare to twink & twunk:
Femboy/Tomgirl/Mollygirl/Calicogirl/Janegirl: A man who presents femininely.
Flamboyant: A man who dresses or behaves in a dramatic (perhaps a bit bratty), exuberant, flashy manner. Oftentimes this is considered to be "feminine energy", because of how men and women are stereotyped (and how men are not expected to have this type of energy.) This isn't an inherently queer term, nor is it inherently limited to men - it is just most often applied to queer men.
Softboy: A man who has soft/gentle physical and/or behavioral characteristics. This isn't an inherently queer term, but is often used for queer men.
Twink: A skinny queer man who bend traditional gender roles in some sense. Twinks may be femboys, flamboyant, softboys, or some combination.
Twunk: A slightly more muscular twink, considered the in-between stage of a twink and hunk.
(Note 1: Enben and genderqueer women may identify as femboys, softboys, twinks, and twunks too.
Note 2: Don't call any real person any of these terms, unless they explicitly identify with them - especially not trans men and/or intersex men who have less androgenized/more estrogenized characteristics.)
Conclusion: Not all femboys are flamboyant, not all flamboyant men are femboys, and not all softboys are femboys.
