Looks like i missed some interesting stuff. Also, pretty sure from context that seed flaps are just lips. Though I'm not sure, because apparently trolls have a ton of genitalia. And also the non-gender sexuality wasn't a thing then, because Karkat obviously assumed that only a female would be interested in Sollux, if any of them were interested in him.
Right now though, it's pretty obvious that most trolls are male though. By defining males as ones that give genetic material to the egg, and female as the ones that form the egg, then only the mother grubs are female. I'm not sure whether to consider ordinary trolls male or to consider the imperial drone male, and I'm going to ignore the idea that the imperial drone is relatively new, because it doesn't match with my personal ideals, and it's only a fan theory anyway. It's pretty obvious that they consider themselves to be male or female, and there are probably bodily differences, but I'm guessing both "genders" have all of their organs. Possibly in different amounts.
Edit: Geez rereading this is dumb and redundant. Oh well. Gonna leave those excesses.
I've been attempting to reread the troll arc, collecting terms and body parts to build up a better image of their culture, but I keep getting distracted. And I'm still not sure if they have a skeleton or exoskeleton.