In the Second Age, elves and dwarves traded in Eregion and Hollin. If my memory serves correctly, Galadriel and Celeborn dwelt with those elves for a time, and possibly some of those elves followed them to Lothlorien. Perhaps this is how they knew about cram. Or maybe some dwarves wandered into Lorien once upon a time, but given the animosity between the two species I doubt it.
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