Above is a magnet that used one of the many PETER POTAMUS character art inkings I did for Hanna-Barbera licensing. When the designer was laying out the PETER POTAMUS style guide, I suggested she add HIPPO HURRICANE HOLLER to this pose. Not sure why there are little white areas on PETER's eyes and in his nostrils, though..jpg)
Here's a vintage color model sheet of PETER POTAMUS and SO-SO, and below is a 1960s PETER POTAMUS Halloween mask.