Monsters go to school, too. Sometimes, viewers don't respond to it so well.
Four years after NBC & Hanna-Barbera bombed by having comic Rick Moranis as a teacher at Gravedale High, Nickelodeon commissioned a spooky school series from Klasky-Csupo (Rugrats, Duckman, etc.). Well, maybe not so spooky.
Aaah! Real Monsters focuses on a trio of young monsters attending school, but otherwise illustrates the myths parents have about monsters hiding under children's beds. The voice cast includes Tim Curry (Wild Thornberrys), Jim Belushi, and others.
Shout! Factory owns the rights to the DVD release, and following is the trailer:
No rating. Never saw the show.