That's Agriculture.
A reminder of potential teachers among prisoners:
Keep in mind there's a limited amount of households, many of them only accessible during a certain weather and time only.
I've said that before, but it would make sense if you could learn such basic skills with the right tool (an axe in that case), and spend 2-3 days just trying to chop wood in Gobtown (so about 10-12 attempts, which would drain more stamina than usual).
The need for a teacher is more justifiable with crafting jobs (Smithing, Alchemy...).