Tuffwing

Tuffwing is a wild Changewing who was briefly captured by the Dragon Riders in order to get his acid. He first appeared in Night of the Hunters Part I, and later appeared in Dragons: Rise of Berk.

Description
"This elusive Changewing was briefly trapped by Tuffnut, who said of the Dragon, "To fully understand a Changewing, you have to become a Changewing." "

Appearance
In Night of the Hunters Part I, Tuffwing has the appearance of a normal Changewing. However, in Rise of Berk, Tuffwing has yellow patches on his wings, though this is most likely only added in order to differentiate him from other ingame Changewings.