There's a mod called "Not a farmer" and I don't understand how to change from "Farmer" to "baker". Any tutorial?
Looking at the content.json file, looks like you can change it from Farmer to baker (or Baker) in the config.json that gets created. Or, if you have GMCM, then you can do this in game via the Generic Mod Config Menu cog.
If, for some reason, you can't access the config.json file, then you could always go into the content.json and change every reference for "Farmer" to "baker".