Oswald [heard once in season 1]
Lalaloopsy [Heard once March Of The April Fools]
Spongebob Squarepants
Olivia [Heard once In Olivia Plants A Garden]
Ni Hao Kai Lan [Heard once in Kai Lan's Great Trip to China]
The Backyardigans [Heard once in Riding the Range]
Adventures in Odyssey [Heard in Race to Freedom]