Walt Simonson turned Thor into a frog for three whole issues. And it wasn't one of those cop-out "it was all a dream" stories either. Thor did turn into a frog. Get THOR Visionaries: Walter Simonson vol. 3 for the "Throg" issues. Heck, get all of Walt Simonson's run on Thor. So far, his run has been collected in four volumes of the Thor Visionaries trade paperbacks. One more volume to go. Collect 'em all. They're all good.