You CAN get hatchlings to take frozen thawed as their first meal but it's very hit or miss (mostly miss). You'll need to heat the mice up to about 100 degrees and dance them around in front of the snake on a pair of hemostats, you'll have to keep reheating because they cool down pretty quickly. It's best if you can keep the room somewhat dark during this time, You'll also want to give them a hide box that they fit snuggly into and dance the prey in front of the entrance.

However after a few years of messing around with this, I just feed live hopper mice to everybody now. It's rare that I have a hatchling hold out longer then a month with live hoppers. I've left hoppers in with hatchlings for days at a time without ever having a snake get injured by a mouse.

Once you have your snakes feeding regularly and reliably, and they know when to expect food, THEN it's easier to switch them to heated frozen thawed.

Mark