HD 3+1 AC 6 1d8 F1 MV 15 ML 9 XP 65
Numbers: 1d4. Most of the time there will be only one or two wild pigs, possibly with some young piglets which won’t fight. If more are encountered, these are mostly aggressive young males.
Giant Boars do exist. They are bred as mounts by dwarves and halflings.
HD 5+1 AC 6 1d12 F2 MV 15 ML 9 XP 260
Demon Boars also exist. They are manifestations of forest guardian spirits. As such, they are usually not a problem. When the forest suffers, these spirits can be corrupted.
HD 9+1 AC 3 1d12 F9 MV 15 ML 9 XP 260; charm person 3×/day; shape change into human form at will; magic or silver weapon required to hit
Treasure: A guardian spirit will usually have a dedicated temple in a holy grove within its forest. 50% for 1d6×1000 copper, 50% for 1d4×1000 silver, 30% for 1d6×1000 gold, 10% for 1d4×100 platinum, 50% for 2d6 gems, 50% for 1d6 jewelry, 20% for a magic items.