Problem there is that the LTs' primitive "caves of the Rodothlim" evolved in the Turin poem into the great fortress of Nargothrond, a new conception with a new name; Rodothlim or variants thereof disappeared. I would use Nargothrim.
(the element (g)rod (from *groto "cave, tunnel") survived into late Sindarin, as in Nogrod and Menegroth, but I doubt generic "cave-dwellers" would have been applied to Finrod's folk).
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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