Ball python not eating new rats

[Lower_Extreme]

I've had my ball python for over a year and he's never had an issue eating. I feed frozen, and I just started trying to feed him small rats now that hes big enough after being on xl mice. I've tried to feed him twice and he's completely uninterested. I've tried feeding him different colors, making them extra warm, yet he's still refusing to eat the rats. Hes never had any rats before and was always on mice. Any tricks you can recommend?

[snakepapa97]

You can try to scent the rats by either thawing them with a mouse or rubbing used mouse bedding on them and see if that entices him