The Puff Nadder is only mentioned once in the book, How to Speak Dragonese.
No description of any kind if given for the Puff Nadder.
This dragon is cooked as a snack for the Fat Consul and is listed on a dinner menu.
- Fan Theory: An unnamed dragon in the How To Train Your Dragon movie credits could make a good Puff Nadder. It resembles a spiny pufferfish, and would explain why "puff" is in its name, It would also explain why anyone would consider cooking one (as pufferfish are eaten in certain parts of the world).