I literally just had this problem with my 2015 3 month old albino ball. My post is probably a week old. He wouldn't eat for a month from when I got him and I tried absolutely everything, frozen, live, offering at different times of the day, scenting he had no interest in the food. As a last resort I got a live mouse, stuck both of them in a plastic bin and closed the lid and covered it all over with black paper (as long as its dark) and just peeped in if I heard any noise or stayed close just in case. After 30 minutes of cornflake trying to escape paying to attention to the mouse he finally sat on the bottom, when I had given up and was about to take him out he snapped, coiled, and ate. I don't know if he was just annoyed with the mouse sniffing him and killed it to get rid of it or if his instincts kicked in but he ate and that's all that mattered. Cornflakes had became so skinny I could see his back bone all the way down, his neck was to small and if was to the point where if he didn't eat that day I was gonna have to force feed him. Try this and see if it helps. It was the only thing that worked for me.
P.S. I also put a drop of tuna water on the lives head, I don't believe this mattered to him since he was not interested for 30 minutes until he realized he couldn't get out it was him and the mouse but it's worth a shot, I will be using this method in the future to try to wean him into eatting frozen.)

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