Thawing can be a process all in itself - and if you have a bunch of critters you'll need to give up some freezer room for the ratsicles. I at least know that the (unintentional colony of) rats they all get p/k have been well cared for and well fed. Though on second thought 100 frozen rodents take up so much less space than 100 live ones . . . and the frozen ones don't need to be fed . . or have their enclosures cleaned.