Another thing to keep in mind is that boiling water has the potential to cook the rats - something you want to avoid. I generally let my rats thaw out and then place them in hot water (just hot enough that I can stick my finger in it without getting burned) in a zip lock bag.
You can also try lightly dangling or nudging the rats with feeder tongs to simulate a live rat. This has always worked for me when I get a stubborn eater. Using feeder tongs to keep your smell away from them helps too. I've also found it helps to keep yourself "hidden" from the snake's view. If possible, make sure the snake has some sort of covering over it (as in stick your tongs in through an opening in the cage, not take the lid and his hide out and wave the rat around).
Of course, they could just be adjusting to their new habitats.
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