The Snaptrapper is a Mystery Class dragon released on October 23rd, 2015. They can be purchased for 750 gems (600 for members) from the store.
From the How to Train Your Dragon Wiki:
- "With triple-split jaws on each of this Mystery Class Dragon’s 4 heads, it looks like a man-eating Venus Flytrap, just not as friendly."
For more information on the Snaptrapper, visit here.