Wiktionary
melonhead
n. (context US English) One of a group of legendary beings, known in parts of Michigan, Ohio, and Connecticut, and generally described as small humanoids with bulbous heads who occasionally emerge from hiding-places to attack people.
Usage examples of "melonhead".
She finds Melonhead living here, and he does not let her escape back into the bush, but comes after her, happy to see her well and alive.
Her pregnancy, well advanced by now, is hidden by a large cape, but it doesn't take long for Melonhead to notice and ask her if it's Antonio's child.
Tan-Tan, strengthened by her relationship with Melonhead, fired up by her Robber Queen costume, finally gives a speech that is not a made-up story, but the truth of what happened between her and Antonio.