These are mysterious, nasty creatures from a Hobbit poem by J R R Tolkien. Not much is known about them except that they live beyond the Merlock Mountains and that they have squishy feet, a lust for gold and a taste for human (or hobbit) flesh.
These grim marsh ghols have always had an appearance in my MERP campaigns. They are a lot of fun, and have given my players a few sessions to remember! I wish I had these pics available for their last appearance a couple of years ago.