The dinosaur husband and wife are just one puppet edited to look like two.
Chuck Dairy can be seen blowing through Twigopolis, but isn't featured as a credited character until episode 111 "The Great Tofu Drive."
Gluko and Lennon only speak over the credits twice throughout the season.
Jessica McKenna, who voices Lennon, has an extensive background in improv comedy, including studies with the Upright Citizens Brigade and the Groundlings.
The voice of Fred Tatasciore, who plays Gluko, can also be heard as various characters in Disney Theme Parks, including Darth Vader, Groot, Bigfoot and the safety narrator for Space Mountain.