Shooters are dragons mentioned once in How to Seize a Dragon's Jewel, as one of the many strange dragon species that can be found in the Amber Slavelands.
There is no further information for this dragon, and not much can be gleaned from its name, other than perhaps it "shoots" something. Since Brainless Leg-Removers are classed as Sea Dragons, perhaps Shooters can be, too.
- How to Seize a Dragon's Jewel (Book 10), Cressida Cowell. 2012