Here is something I have been doing with pretty good success for getting stubborn rosyboas and sandboas to eat frozen/thawed mice. By stubborn snakes, I mean snakes that will eat live no problem but snub f/t.
1. Thaw the food item.
2. Warm it up through and through to 95-100 deg and immediately feed.
I use warm water typically, and sometimes a heat gun depending on how many I am feeding.
Although this does not work necessarily for every individual, it has made a big difference with my stubborn snakes. These animals want warm prey, not cold. Give it a try if you have snakes that refuse f/t. Like I say, it does not work for every snake, but it has gotten some of my otherwise staunch live feeders to feed well on f/t.
