Ok so I need to say what I headcanon about the humans cus i havent thought of any equivalents for the trolls just yet. I only have headcanons about two of the humans, Roxy and Tavvy.

With Roxy, I imagine him having some sort of gonadal dysgenesis, because I think Candy!Roxy gives birth? I think thats what happened (I didnt really read the epilogues I just skipped to Beyond Canon (oops)). And there are documented cases where people with XY give birth.

Tavvy I headcanon with De la Chapelle Syndrome.