The bacteria thing may be true but people don’t give snakes enough credit, their digestive system is very strong. I’ve reheated many many times and even refroze and fed at a later time. I rarely need to refreeze because I have many piggies that will take leftovers but through the years I’ve done it with no issues. I wouldn’t feel comfortable going more than one refreeze but you probably could, they eat half rotted dead animals in the wild if they are hungry enough. I’m not recommending to feed your snake rotting food but my point is, their digestive systems can handle a lot more than most think.