I don't have any tutorial suggestions but I don't see why you wouldn't be able to make this with Unity for Android.

I'am searching for a good tutorial on how to make a little farming game.

You probably won't find any.

You are looking at a project requiring many work-months (likely work-years) when done by professionals. There is an enormous number of tasks you need to do. Some of those individual tasks may have tutorials, such as how to load models, how to run animations, etc., but there is no massive tutorial on how to craft a full-blown project like that.

The only "tutorial" for making a specific game is research and practice. Most people who are willing to give good advice will always suggest doing things on your own.

Out of curiosity, have you ever programmed a game before?

Your best bet would be to do it yourself. Generally what I do at the moment, as I'm learning myself, is when I get stuck on something I find a tutorial or code snippet online of something similar and change it to what I need. That way you learn how code and change the code as you need. It's not just copy paste, and makes you think.