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Sorry, no etymologies found.
It was a bright and beautiful sunshiny day, and Uncle Wiggily was hopping along the road, thinking many thoughts and about the busy bug and the black cricket and all things like that and how hard it was to look and look for your fortune and never find it, when all of a sudden, just as he happened to put his crutch down on a round stone, it slipped, and down he fell kerthump.
The Ice was so slippery that when he got about halfway, his feet slipped from under him and he fell kerthump!
The prefix ker kerplunk, kerthump emerged by the 1830s as a way of conveying, by its sound, the sensation of something heavy falling to earth.