What are all the names in Scooby Doo ghoul school?

It seems you're mixing up your Scooby-Doo! You're likely thinking of "Scooby-Doo on Zombie Island" (1998). That movie doesn't feature a "Ghoul School".

You might be thinking of:

* "Scooby-Doo! On Zombie Island" (1998): The main characters in this movie are Scooby-Doo, Shaggy, Fred, Daphne, and Velma.

* "Scooby-Doo! and the Ghoul School" (2018): This movie has a different cast of characters, including:

* Daphne Blake

* Velma Dinkley

* Scooby-Doo

* Shaggy Rogers

* Crystal

* Tara

* Frankie

* The Ghost of Mary (a former student)

* The Principal (a vampire)

If you are interested in the 2018 movie, "Scooby-Doo! and the Ghoul School", I can tell you more about the characters.