Ratsicle

The negative aspects of pre-killed rodents generally focus on two things: the initial killing of the rodent, and the prospect of opening the freezer to find a "ratsicle" next to your frozen pizza.

I'd just fed Rocky the Boa his weekly ratsicle the day before — as evidenced by the golf ball-sized lump in his midsection […]

The aviary was high enough for him to hop and flap up onto his perches, and there was water for him to take his baths, along with the remnants of a ratsicle, yesterday's supper.