Nah, I just think the Mother Grub is a substitute for breeding (Maybe only in Beforus, cause the Trolls are more different there)

I mean, I feel if Trolls were biologically capable of reproducing normally, Kanaya wouldn’t have been as worried about the future of her species. Also, Beforan Trolls aren’t that different, only socially/culturally, and even then kind of as an inversion rather than a deviation.