Junior Tuffnut

"Back in line, Tuffnut Junior. You, too, Junior Tuffnut. What was that? Tell me you didn't just back-sass me, Junior Tuffnut, Junior."

- Tuffnut

Junior Tuffnut is a Gronckles that originated from Dark Deep, and they were all named by Tuffnut.

Encounter with Hiccup and Fishlegs
Junior Tuffnut and its comrades first encountered Fishlegs, Meatlug, Hiccup and Toothless shortly before they were ambushed and chased away by a Catastrophic Quaken on Dark Deep in the episode, "Quake, Rattle and Roll". Junior Tuffnut, along with its friends Junior Tuffnut Junior and Tuffnut Junior were temporarily relocated to Dragon's Edge, much to the annoyance of the other Dragon Riders. The Twins were placed in charge of them while the other Dragon Riders devised a plan to make Dark Deep more hosiptable for them. Later, they returned to Dark Deep and befriended the tormenting Quaken, who had become more welcoming thanks to Fishlegs and Meatlug.

Physical Appearance
Junior Tuffnut is an orangey-brown Gronckle with a pale belly and red knobs on its body. As with most Gronckles, it has yellow eyes.

Trivia

 * It is possible that Junior Tuffnut's name was inspired by Tuffnut's original name from the books, Tuffnut Junior.