While 'futa' is an offensive term, biologically speaking they do exists, hermaphrodite and intersex people - to be precise. I don't know what about that is disrespectful to trans people, considering intersex people could also be transgender.
Intersex people arent hermaphrodites, true hermaphroditism is impossible in humans. Intersex means between male and female, not both, what the word “hermaphrodite” means is both secondary sex organs, so ovaries and testacles. It is impossible to be born with both a penis and a vagina as a human
