Monkberry Moon Delight is Paul doing his best Zappa impression.
Maybe, but it’s based on the youthful gibberish of his young children. Apparently, their word for milk was “monk.”
And it’s pretty much impossible to cover this song properly as Paul himself sang it (that is, with a relentless guttural growl). Probably the best cover came from Screaming Jay Hawkins. Yes, he has that guttural growl, but he just butchered the song, in my humble opinion.