Using an article on the Barrow-Downs by the Barrow-Wight himself, I learn that the Olog-hai were Sauron's doing. They were bred by him and taught a rudimentary language. But to say that this is as smart as Trolls get is to miss the point of this thread. Trolls could have been more smart, or more anything, had JRRT wanted.
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Los Ingobernables de Harlond
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