Wolfhooks can be found under trees near Wolvendom. Sometimes they are hidden in bushes. Use sword unit to cut bushes out.
You can get 20 or more Wolfhook here.
You can purchase Wolfhooks from Botanist Chloris. The refreshes every 3 days and the items don't change. You can't see her at night.
All Liyue Luxurious Chest Locations
Genshin Element Guide
Mondstadt Region Puzzles, Secrets, and Hidden Chests
Retracing Bolide
Lucky Dog
Mondstadt Side Quests
Violetgrass Farming Map