From Wikipedia, because I told you I am lazy…..
A nuggle, njuggle, or neugle, is a mythical water horse of primarily Shetland folklore where it is also referred to as a shoepultie or shoopiltee on some parts of the islands. A nocturnal creature that is always of a male gender, there are occasional fleeting mentions of him connected with the Orkney islands but he is more frequently associated with the rivers, streams and lochs of Shetland. He is easily recognised by his distinctive wheel-like tail and, unlike his evil counterparts the each-uisge or the nuckelavee, has a fairly gentle disposition being more prone to playing pranks and making mischief rather than having malicious intents.
So that would be Waffle then.
He would never do “malicious intents” because that would involve effort.
And he most definitely has “a fairly gentle disposition”.
And I’ve just read “during 1918 the anthropologist James Teit hypothesises that, as is common with most supernatural creatures, nuggles were thought to be fallen angels”. Now that I can believe!
So now you know what a Njuggle actually looks like. It is Waffle in disguise and his home is in the watery bog at Leradale.