There are a lot of factors:
1. When did he start eating frozen thawed?
2. Did something change in October? Did you upgrade the enclosure or move the snake to a new home?
3. How much does he weigh?
4. Have you tried a different batch of rats?
8 months is about where I would expect a full-size male to go off a hunger-strike (assuming no environmental conditions are out of alignment).
A lot of my adult male bps are just starting to come out of breeding mode and are eating again-however, mine usually stop around February and resume in June.
If his feeding schedule was consistent and he has not eaten since October: I would not rush thaw a rodent in the off-chance he might take one tonight. Feed him one that is frozen in the center and he might develop an immediate aversion.