When a student copies an essay online instead of writing it and then painstakingly changes every word to a synonym until the text no longer makes any sense...
call that the Ship of Thesaurus
Any educator who doesn't feel this on a visceral level has never had to experience the psychic pain of reading the phrase "Unused York City."
A lecturer at Middlesex University in 2014, Chris Sadler, coined the term "Rogetism" for these. Perhaps the best:
I'm trying to hide my plagiarism but the clapping of my sinister buttocks keeps alerting the lecturer