Boars are a more aggressive form of Pigs whom can be found replacing pigs in many biomes. But they differ from their pig cousins in many ways. They are passive but they will turn hostile if you try to attack them. Their drops are the same as pigs (Pork chops and Cooked Pork chops if they die while on fire). Players are able to tame and ride the boars. Taming is very similar to taming a Warg you just place a saddle on a Boar and you're good to go. Boars do not have armor like Horses and Wargs. They are also able to float over water similar to a Warg. You can hire Dwarf Warriors and Dwarf Axe-Throwers riding Boars from a Dwarf Commander. Dwarf boar riders do not spawn naturally.
Dwarves riding Boars on the right is a Dwarf holding a throwing axe and on the left is a Dwarf holding a Battle-axe
Player riding a Boar