Treebeard (and other ents, for that matter) is not completely a tree, but he is definitely not a man. Ents are a species on their own, and shouldn't be thought as men with tree-like figures. They're much closer to trees, but are not trees, just as hobbits are not men.
Tom Bombadil did not appear as an Ent at all, and we're given no reason to believe he is. Surely an ent would be influenced by the One Ring just as elves, hobbits, men, and wizards were.
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...take counsel with thyself, and remember who and what thou art.
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