First off, a 2 year old male can go off food for WAY longer than 2 months without issue. I had a mojave stop eating for 8 months before he decided to continue eating again. I wouldn't be too worried about him; sometimes they just need a long period of time on their own in a nice warm enclosure. Only look at him to change water, and give him a whole month without offering any food. Then try f/t again and if he is still not interested, give it a week and try live.