Gastrula

"There it is! Gastrula!"

- Captain Bungo Bung on approach to Gastrula in the Chubby Gundark

Gastrula was a planet in the Outer Rim Territories. It was the homeworld of the Gastrulans. During the Galactic Civil War, Captain Bungo Bung established the Great Bantha Breakfast Biscuit Run to the planet, importing Bantha Breakfast Biscuits to the locals. However, the biscuits combined with particles in the Gastrulan environment and stale ship air, and mutated into the Giant Amorphous Bantha Breakfast Biscuit. The resulting lifeform set out to consume the entire planet.

Behind the scenes
The name is obviously a mutation of the word gastric, meaning of relation to the stomach, a reference to the planet's catastrophe with food.