Well, don't limit yourself to what trolls use *now*. You could have a heroquest where, say, Orlanth steals battle-axes from the trolls. "But trolls don't use battle-axes!" "Well, *duh*. That's because Orlanth stole them."
And another possibility: Orlanth--or rather, his faithful thane Humakt--stole a sword (Death) from the underworld. The underworld is, of course, where trolls live. You may be able to do something with that. If nothing else, I'm sure there are a lot of low-powered "echoes" of that great myth--that is, instead of the full-powered "Humakt and Eurmal steal Death from Subere and give it to Orlanth" quest, you could do some quest like "Hrothgar the Sword and Thelik the Gibberer broke into the troll caves, stole their treasured magic sword Keenblade, and gave it to their tribal king".
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