I can't really see trollkin taking up scare resources and thus denying them to the troll population. As long as the wild trollkin population isn't too far out of hand, you just have a Big Feast and knock down the wilder population. I'd think the big problem for the troll race lies elsewhere:
> But trollkin are only useful to trolls as a species if a
> trollkin's life or death prevents a troll's premature death.
Ironically, the trollkin may well *encourage* the premature death of
dark trolls. The Uz of Dakori Inkarth field a suspiciously large military
force (TP said about half the population serve in the army/militia, if
needed, though that may have gone down in the 3rd edition). The "greater"
trolls are probably in the army/militia/mercenaries in skewed numbers;
the slavey trollkin provide some levy, but many more labor to prop up the
economy of Dakori Inkarth and support all those ZZ gangs.
The problem being, of course, that your (breeding) greater trolls may well to die horribly in adventuring, raiding, etc. So you're losing your uzko population while your enlo are at home, toiling away. Any troll political entity can't afford to be on the losing side of a Cannae; it'd kill off too much of the uzko population.
The trolls *could* reduce hunting expeditions, military expeditions, and give up yet more territory, or they can continue to devote large numbers of full trolls to arms despite the fact it might further weaken the troll race. Shades of Paul Kennedy.
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