Wild Boar are a game animal mentioned briefly in the How to Train Your Dragon Book series.
Wild boar (Sus scrofa), is a hooved omnivore inhabiting Europe and parts of Asia and Africa. pigs have been domesticated from the wild boar, though boar generally have less mass in the rear and more bristly hair. Unlike other hooved animals which are fairly strict herbivores, boar have a very diverse diet, which can include carrion, small animals like fawns, bracken, worms and a wide variety of plant material. Their diverse diet allows the boar to be a very adaptable creature and also a major pest of agriculture.
In both the Book series and real life, wild boar are hunted for their meat and the sport it presents. Boar are also used as a metaphor in the Book series.
Dogsbreath the Duhbrain is described as being "a mindless thug of a boy with hairy knuckles that practically grazed the ground as he walked, and mean little eyes and a big ring in his flared nostrils made him look like a bristly boar with a bad character."
Wild Boar are also mentioned in How to Steal a Dragon's Sword when Toothless goes out hunting behind Hiccup's back, and eats the wild boar he hunted. When he flies back to Hiccup, he still has wild boar in his mouth and is chewing it. Hiccup scolds the little dragon, and Toothless lies about not having boar. Hiccup is able to quickly point out Toothless' lie due to the scent.
Several wild boar dishes appear at the Freya's Day Eve feast on Hysteria including roasted boar, wild boar stew, and wild boar sandwiches.