Sounds like something I've seen ball pythons do when they are finicky eaters. Stick to live until he starts eating better for you. I would get a mouse hopper and let him sort it out with that. Then maybe after a feeding or two depending on how you think he's eating you can switch to frozen thawed.
When I have picky eaters that are under 100 grams I'll usually do mouse hoppers, but if they're eating no problem then I'll do the switch to a rat pinkie and stick them on that then I'll go up the sizes quickly.
Good luck and keep us updated on the situation. It's nothing to worry about though.
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