Brian,
We typically start ours on live fuzzy rats, and move them to pre-killed within just a few meals. Usually by their fifth feeding, all of our young bloods/STPs eat pre-killed. We typically don't feed frozen-thawed simply because we raise our own rodents, but one important point to keep in mind when doing so, is that bloods & short-tails rely heavily on their heat-sensing pits for detecting prey. Make sure that any frozen-thawed prey you offer has been warmed up significantly, 105 deg. (F) works great (use a temp gun) so that your snake can really key in on that rodent.
Good luck!
K~
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