I've always been curious about the origin of Kloaks. My theories have ranged from the ludicrous and illogical notion of them being mischievous parrots flapping around in old pirate coats, to the far more likely possibility of them being the spirits of fallen Krooks.
They mightn't be an exact match, but the similarities are undeniable — especially since they're both known for throwing objects at hapless primates!
As for Kackles... well, they are a bit odd in that they're both ghostly
and skeletal. They're bigger than Klubba & Kudgel, and have a longer snout — more like most other Kremlings. I can't think of a particularly close match for them — although they're obviously missing their legs, like Klomps/Kaboings, and carry swords like Kutlasses...