Description of Green Man here; sounds like a human head surrounded by, or growing out of, leaves........does sound a bit Bombadillesque (Bombadillion? Bombadillionish? Bombastic?)
I've been searching for images of Ol' Tom......sketches, artist's renderings, whatever.....but no luck. Closest I came was a painting of Goldberry and another of Tom's house (which looked exactly as I picture it.)