heffalump

A heffalump is a fictional, elephant-like creature mentioned in the Winnie the Pooh stories by A. A. Milne. Heffalumps are mentioned in Winnie-the-Pooh (1926) and The House at Pooh Corner (1928). Although this is never explicitly stated, it is generally thought that heffalumps are elephants from a child's viewpoint (the word "heffalump" being a child's attempt at pronouncing "elephant"). E. H. Shepard's illustrations in A. A. Milne's original books depict heffalumps (as seen in Piglet's dreams) as looking very much like elephants.
_Wikipedia