The Typhoomerang first appears in The Terrible Twos, and was one of the first new species of dragons discovered on the show. A baby Typhoomerang was accidentally found by Fishlegs and Meatlug and caused them to crash land, describing it as a "flaming squirrel". The same Typhoomerang then passes by Hiccup and Toothless, and after discovering it as a new species, Hiccup takes it back home with him, much to Toothless' dismay.
Back home, Stoick names the dragon Torch after it lights up the fire. However, Torch begins to annoy Toothless, stealing his food and his bed (which Hiccup later assumes is jealously). That night, Toothless hears enraged and panicking cries of an adult Typhoomerang: Torch's mother. As several days pass by, Toothless tries to warn Hiccup, but to no avail.
An adult typhoomerang will form a circle of fire around a predator/prey that could or will mean harm to their babies. It can also control firestorms or create one, by sparking themselves up and whirling in a circle. The ashes are shown to act as fertilizer. This is probably because plant ashes contain many nutrients that plants need.
Eventually, the group takes it to the Berk Dragon Academy to document it in the Dragon Manual, learning that it has incredibly sharp razor talons and is the first and only dragon that does not fear eels, even going so forth to eat one. Snotlout was excited to name it, coming up with names as they documented new facts about this species (i.e. Eel Eater, Sharp Claw, Flaming Comebacker, etc.) When they discovered it spinning around the academy revealings sparks as they burn the ground, leaving a distinctive swirling burn mark, they come up with similes that eventually led to its final name.
A fully grown Typhoomerang can fly at high speeds, near that of a Night Fury. In shape and size, they are comparable to dragons such as a Timberjack.
Much later, the group discovers a large portion of the forest destroyed, with a large swirling marking in the middle. They conclude that it was caused by a giant Typhoomerang and Hiccup finally realizes that this was what Toothless tried to warn him about. Torch's mother suddenly shows up and gives chase after Hiccup, Toothless, and Torch (who kept following them instead of its mother). After they trick the adult Typhoomerang into crash landing, Torch is reunited with its mother and its two siblings, the family of Typhoomerangs flies off.
Defenders of BerkEdit
The Typhoomerang made two appearances in Defenders of Berk so far. It appeared in the Season Premier when the teens study it as part of Dragon fight club. Then in The Night and The Fury, it made a brief appearance on Dragon Island.