For what it's worth, I didn't write that description. The Todal is a monster in James Thurber's book The 13 Clocks. I've never read it (and had never heard of it), but after trivet listed it I got curious about the "blob of glup" thing and did a little Googling. The description I posted comes from this page, which really just summarizes all the fragmented descriptions that Thurber scattered throughout the book. Apparently. I'm not that imaginative. ;-)
A Todal is a creature that looks like a blob of glup that makes a sound like rabbits screaming and smells like an old unopened room. It is made of lip and feels as if it has been dead for a dozen days. It moves about like monkeys and shadows and cannot be killed. It was created as an agent of the devil to smite those who do evil but not to their fullest extent.