Agree. Better to use finely chopped or pureed if you're going to freeze. I've both frozen and dehydrated, and prefer the texture of rehydrated pods to the texture of frozen pods, but feel both have their place.
if you grind the chiles before freezing, put them into pint Ziploc bags and freeze them flat. Makes it easier to break off small chunks, re-seal the bag and back into the freezer. I like Noah's idea for grating frozen pods. PS- are you coming to the NWCF in August?