I make poppers from frozen jalapenos a lot. I cut the stems off, remove seeds before I freeze them. I don't defrost them, just stuff full of cream cheese or whatever you are using, wrap in bacon and bake or fry. Delicious. Peppers can be diced, chopped or left whole to freeze. As has been said they lose some crispness so are best used in cooking, sauces,etc. The flavor is still great just they get a bit limp after thawing. Freezing is a neat alternative to processing them all at once, especially if you have lots of peppers.