Jimbobs (Named "Gegene Electrique" on The Snoring Dragon Inn) are blue, raptor-like dragons that can discharge electricity from off their bodies. Jimbobs can move very rapidly, making them difficult to dispatch. One of their weaknesses is that they cannot swim, and you can kill them by leading them into water, similar to the Dragon Feux.
They are not immune to their own lightning strikes and leading them to water will not only cause them to drown, but it will cause them to electrocute themselves.
The dragon seems to be shinier in the show then they were in the movie,