I have 15bpz, a jcp and a little western hoggie and all of them are fed f/t rats except the hoggie who is still on f/t mice. Believe me, it takes some time too feed frozen but my better half would not allow live. In the morning I take all of the food out of the freezer and place them in individual tupperwares according to size. After a couple of hours they are at room temp that I check with a temp gun.
I crack open all of their tubs open from the racks and get the hair dryer going on the rats. Most of the time they will all go nuts as the smell enters their tubs. I zap the rats with the temp gun til about 100 and dangle it in front of them. Each bp has a different technique when they eat. Some will strike as soon as i dangle the rat. Others I will place it in front of their hide. My jcp will only eat when I lay the rat across his climbing branches. Some of the bpz won't show any interest at all and I just try the following week. With some time and patients, it can be accomplished. Good luck and keep us posted.