You've got it a little backwards - multiple births are always trollkin BECAUSE multiple birth is part of the definition of trollkin. Before the trollkin curse, multiple births where unusual but known (such as Gore and Gash). After the trollkin curse (or more specifically, after Naxili Gorangs failed attempt to break the curse), multiple births where both very common and almost always trollkin - so it became customary to consider multiple births as being trollkin.
Of course, it is possible that true trolls that just happen to be multiple births can be reclassified as trolls later - all they have to do is meet the (more stringent) requirements for Kygor Litor initiation, and they are then retrospectively classified as trolls.
Cheers
David
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