It does not say in the Hobbit that the Giants were Trolls of some sort. In the Complete Guide to Middle Earth, stone-giants are described as
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creatures of great size and strength living in the high passes of the northern Misty Mountains The stone-giants are mentioned only in the Hobbit, and may be no more serious than Golfimbul
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Golfimbul being the Orc whom Bandobras Took beheaded in the Battle of the Greenfields with a club and the game of golf invented,