On this page of the Assassin's Creed Valhalla guide, you will find a detailed walkthrough for The Boar with the Golden Nose side quest.
Rewards: 1,200 XP.
In the place marked on the image above, you will meet a boar charmer who claims that his sow is able to search the ground for real treasures.
Once Lady Trotters catches the trail, follow her. After a while, the boar whisperer will dig out the first treasure from the ground - old fleeces.
After the man goes to rest a bit, Lady Trotters will catch another lead - follow her. As soon as she stops, dig another object out of the ground. After a while, the pig will catch another trail that will lead you to another not-so-valuable find.
On the fourth try, the animal will lead you to a place guarded by a bunch of bandits who will try to take Lady Trotters away from you. Defeat the enemies and dig up the last treasure to finish the mission.