That means

Spike = Beast
Soarin = General Chang
Discord = Prince “Charming”
Cheese = Eric

My Backyardigans DVD Collection (2021 Edition) (2014-2021)
It’s Great to Be A Ghost! (Print Date: August 14th, 2015)
The Snow Fort (Print Date: November 4th, 2015)
Polka Palace Party (Print Date: January 7th, 2016)
Cave Party (Print Date: February 26th, 2016)
Surf Up! (Print Date: June 1th, 2016)
Mission to Mars (Print Date: September 16th, 2016)
The Legend of the Volcano Sisters (Print Date: January 13th, 2017)
Movers to Arabian (Print Date: May 31th, 2017)
Into the Deep (Print Date: July 22th, 2017)
Secret Super Spy (Print Date: August 3th, 2017)
The Tale of the Mighty Knights (Print Date: January 7th, 2018)
A High-Flying Adventures! (Print Date: March 3th, 2018)
Mighty Match-Up! (Print Date: July 1th, 2018)
Escape from Fairy Tales Village (Print Date: September 20th, 2018)
Robin Hood the Clean (Print Date: January 25th, 2019)
The Backyardigans Singing Sensation (Print Date: July 7th, 2019)
Robot Rampage (Print Date: September 19th, 2019)
Join to the Adventure Club! (Print Date: January 19th, 2020)
Escape to the Tower! (Print Date: March 31th, 2020)
Operation Elephant Drop (Print Date: July 7th, 2020)
Christmastime with The Backyardigans! (Print Date: September 30th, 2020)
We Arrrr Pirates! (Print Date: March 17th, 2021)

Charlotte La Bouff is technically not a Disney Princess. But Tiana is.

Are you going to write a fanfic about the mane six as Disney characters?