The Timberjack is a member of the Sharp Class of dragons. Prior to its release on December 25, 2015, the Timberjack had already appeared in the game as the first species of dragon that players could not add to their stables.
Timberjacks were originally added to the game as the fast-travel taxi. Initially the Timberjack in the game, this single dragon had no name and players were meant to assume that each taxi location was a different Timberjack, a fleet of taxi dragons to ferry players around. Despite this being the official position based on the wording of release updates, many players assumed that there was merely one taxi Timberjack: Stokehead.
This belief was bolstered by the release of Stokehead's Flight Club Hero Levels--free for members but costing 250 gems for non-members to unlock.
For a time, taking the taxi Timberjacks would allow players to take a short ride on one, but this aspect of the taxi system was later removed in favor of an instant teleport to a player's chosen destination.
With the presence of Timberjack animations in the game, hackers were able to create a Timberjack 'skin' and apply it over another dragon, obtaining a Timberjack-lookalike before the Timberjack was released into the game. These skins were known amongst players as 'Timberhacks' and, as far as anyone knows, have all but disappeared since the Timberjack was officially released.
A recent update removed the Timberjack taxi dragons, replacing them with the World Map instead.
One of the largest dragons in the game, the Timberjack is rarely seen around campus. This dragon's signature ability to cut trees with the razor-sharp edges of its wings can only be seen in Stokehead's Flight Club Hero levels, where they feature as part of the gameplay.
Despite having no legs, the Timberjack gets around just fine on the ground, with a walking animation similar to that of the Typhoomerang.
Stokehead: Making his official debut with the release of his Flight Club Hero dragon levels, Stokehead is a reddish brown Timberjack who lacks any distinguishing features besides his base colors. He is mentioned in a single quest by Gobber, where it is implied that Stokehead is used to help out with the school's Icestorm Island expansion. Stokehead is notable for being a character originating in School of Dragons and then appearing in Rise of Berk, since often the opposite is true.