Use Facebook long enough and you'll come across just about anything after awhile. Such was the case of a user asking about putting game stats to a creature called a Squonk. Curious, I ran a few Google searches and found several references to the odd little beasties. What follows is a bit of an amalgam of what I found.
The Squonk is rumored to be the ugliest creature ever. It's loose skin is ill-fitting and covered in warts and blemishes, causing the creature to be extremely self-conscious and morose. Aware of it's appearance, it hides itself from all other creatures deep in remote forests, spending much of it's time weeping.
These elusive creatures are very difficult to track, being experts at moving silently and hiding. They even have the ability to camouflage themselves, becoming nearly invisible at will as long as they stand still, but the soft sound of their weeping will often give them away if someone takes the time to listen intently.
When cornered and forced to fight, a Squonk will rush at a target and jump forward, changing it's body into a large quantity of water at the last moment. The target will be hit, as if by a giant water balloon, and must make a Dexterity Save, or be bowled off their feet and temporarily blinded, allowing the Squonk to reform and continue running away. Attackers attempting to hit a Squonk will find the creature to be incredibly quick and agile, avoiding all but the most expert blows.
If captured, or defeated in combat, the poor creatures will blubber and wail, immediately dissolving into a pool of bubbling tears.
Should someone succeed in attempting to befriend one of the pitiful creatures, it will become a willing companion, though it will still avoid the company of other creatures whenever possible.
The tears of the Squonk are valued by Alchemists, as they are believed to possess magical properties.
Squonks appear in, "Fearsome Creatures of the Lumberwoods.", by Cox, William T. with Latin Classifications by George B. Sudworth. (Washington, D.C.: Judd & Detweiler Inc), c.1910