Look into 4H, definitely, also FFA (Future Farmers of America ). I’m sure the colleges will have some camps. I’m in NC, and I know that NC State has a variety of summer programs ranging from Poultry Science to Ag Discovery (https://cals.ncsu.edu/students/my-path-to-cals/summer-programs/). I bet some colleges in TX (Texas A&M?) have similar programs. But I would start with 4H. He might be interested in Envirothon, too. Look it up and see if you can get his school on board. It’s not exactly farm-based, but they study forestry, wildlife, soil science, etc.