The 'Stinger' is a dragon seen in the How to Train Your Dragon Live Spectacular, an arena show that ran from 2012 to 2013. The story of the show is a retelling of the Dreamworks How to Train Your Dragon film (a different plot from the book it was based on) and featured large animatronic and puppet dragons.
The Stinger was one such dragon; a pair of these dragons have a minor feature in the live show. They were said to be juvenile animals, and both had very similar colouration. They have four stingers on their tail; two large ones like the pincers of an earwig, and two smaller ones flanking them.
The animatronics which brought Stingers to live were worn like costumes and piloted from the inside, similar to the raptor costumes used in the Jurassic Park films. The Stinger design does not feature in the Dreamwork's film franchaise or in Cressida Cowell's books, meaning it was an exclusive to the Live Spectacular version of How to Train Your Dragon