Meatlug

Meatlug is Fishlegs' Gronckle from the film. In the film she was kept for Dragon Training and unnamed, but her name is revealed in Gift of the Night Fury. She is partly based in both Horrorcow and Seaslug.

Appearance
According to Fishlegs in "Heather Report Part I", Meatlug is 14 feet long, has an 18 foot wingspan, and weighs 5,724 pounds. She is dark brown in the film, but a lighter brown in Riders of Berk. She also covered in small purple spots.

In the Film
Meatlug is the first dragon the teens are forced to battle during the dragon training lessons. She downs all of them except for Astrid and nearly kills Hiccup. She notably does not even contemplate sparing him, but Gobber yanks her away just in time to save Hiccup. The teens continue to train against her throughout the film, and Hiccup's tactics he has learned from watching Toothless work very well with her. At the film's climax, Hiccup taught his classmates how to ride the dragons before they flew off to rescue their tribe from the Red Death. The Gronckle was ridden by Fishlegs. She fights in the battle, but gets discombobulated by the noise of the Viking shields. She spins out of control and lands on Fishlegs. That ends her part in the battle. She is seen again at the end of the film being ridden by Fishlegs. She and her rider race off after Hiccup as the new era of Berk begins.

In Gift of the Night Fury
In Gift of the Night Fury, it is revealed Fishlegs named his Gronckle Meatlug, and Berk is preparing to celebrate Snoggletog for the first time with their dragons when suddenly the dragons all leave.

Fishlegs is revealed to have chained up Meatlug from leaving until Hiccup accidentally releases the Gronckle and it flies off with him. After the takeoff, Hiccup yells, "Meatlug?!", in surprise that Meatlug had not left. Meatlug did not acknowledge Hiccup until he yelled by taking her eyes off the sky in front of her to look at Hiccup in equal shock for a second before returning to flying. Inside the barn where Fishlegs kept Meatlug, he, Astrid, Snotlout, Ruffnut and Tuffnut discover that Meatlug is a she when they find her eggs in the hay.

Meanwhile Meatlug, with Hiccup on her back, flies to an island filled with dragons and their newly-hatched babies where Hiccup realizes the dragons came here to lay their eggs. Hiccup manages to return all the dragons and their babies to Berk, where Meatlug immediately goes to feed her hatchlings which she left at the barn and is tackled by a happy Fishlegs. Meatlug presumably partakes in Snoggletog with her rider as Fishlegs is holding two of her babies.

In Riders of Berk
In the TV series, Fishlegs and Meatlug establish a very endearing relationship, very similar in strength to Hiccup and Toothless' relationship. They, side-by-side, express that they really care for each other and appear to be both extremely heartbroken when they had to leave each other in the episode In Dragons We Trust. By Twinsanity, Fishlegs has developed a series of hand signals to give Meatlug instructions without needing to speak. In the episode, Dragon Flower, Fishlegs tells a story to Meatlug, which involved Meatlug to cause an awful smell which Fishlegs quotes as: "Smells like rose petals. "

Trivia

 * Meatlug and Fishlegs have a very close relationship; one example of this is that Meatlug licks Fishlegs' feet before he goes to bed.
 * According to Fishlegs, Meatlug's favorite food is Granite.