I would try buying a small batch or individual frozen rodents to try with your snakes first.
Some snakes who are on live don't ever switch to frozen. I'm not saying it's not possible or that they won't switch, but it's good to try out first. I've tried frozen with some of my snakes. Maybe 1 out of 10 will take a f/t rat. The rest go nuts for live, which is why I ended up breeding my own feeders.
Also, in your other thread, you said Manasha hasn't eaten a solid rodent in a few weeks now. The most important thing for you to do is get her to eat. Trying out a new feeding method, such as f/t, now will possibly hinder her feeding response. I wouldn't try frozen yet until she's back on live regularly.