I'm sure i remember something said by Treebeard saying that Trolls were mockeries of Ents created by Melkor, well not created as he couldn't create, but twisted some other form of life into it.
Ok i didn't answer the question on why they turn to stone but at least we get an idea of where they come from
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For him that is pitiless, the deeds of pity are ever strange and beyond reckoning - of Melkor before his final downfall
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