Lets not get bogged down with physics. This is fantasy. Troll's are probably imbued with magic which turns them into stone. Magic is not stupid and if the Troll is wearing clothes then the clothes will turn into stone. If a Hobbit was on the Troll's back then he would suddenly find himself atop a statue. It is not a gradual change from Troll to stone, like the drying of clay. It is magic , and magic is clever.
Remember this my children.
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Los Ingobernables de Harlond
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