Scooby Doo and the Ghoul School

One of the Hanna-Barbera Super 10 made for TV Movies, this features Shaggy, Scooby and Scrappy heading to Miss Grimwood's Finishing School for Girls. Only to learn it was Ghouls not Girls. The female daughters of the classic Universal monsters are his students.

In the Original movie, the girl ghouls were teens. But in this version they are over eighteen, all having a crush on Mr. Norville "Shaggy" Rogers. If Scrappy doesn't Doo it for you, he could be replaced. Perhaps by a horny Daphine, or Velma, or both. Or another Hanna-Barbera character.