"Purple People Eater" (1958? around there) was written and recorded by Sheb Wooley (Pete Nolan on "Rawhide").

How about "Ghost of John [or Tom]" (long white bones with no skin on/oooo, ooooo/ wouldn't it be chilly with no skin on?). I loved that one when I learned it in kindergarten. I was always a bit of a morbid child.