They were large, red skinned, and ordinary blasters could not injure them. They also seemed to like eating metal from starships and various other sources.
Their physiology included a spike at the back of their heads, a spike sticking out from both sides of their necks, four ridges along the back of their neck, a single row of dorsal ridges running down the full length of their backs and tails, and four paddle-like flippers.
The greatest distinction between this species and the seemingly genetically related Ichthyodont were their eyes. The Panna dragons had white eyes with small pupils, and were positioned in the front of their head, while the Ichthyodont had red eyes with large pupils positioned at the sides of their heads.
In 0 ABY, Luke Skywalker encountered one after landing on the planet of Panna to look for Han Solo and Chewbacca. The Panna dragon began feeding off Luke's Y-Wing. The dragon was fought off by Boba Fett with the use of a subjugation prong.
- Star Wars: Tiny Death Star