Rumored to be Jabba's son.
IF that were true then that would make Jabba a FEMALE as of that time.
As well all know (or should), Hutts are asexual in a sense. They start life exhibiting traits of being a male and continue along that path. However once they decide to have a baby, they change their physiology to become female (a real world thing as well, so it's not fiction). Once a Hutt does this however, they cannot revert back to being a male and remain female for the rest of their lives.
This was in one of the novels or tales of books. I just can't recall which one. In the book it was a different Hutt, but the same principle would be applied to Jabba as well since ther eis no differentiation between Hutts and their physiologies.
So again if Rotta is Jabba's son, then as of the OT, Jabba is FEMALE!