I personally think freezing insects isn't a viable option. The freezing/thawing process would destroy what little valuable nutrients they'd contain, rendering them similar in comparison to soggy cardboard. Let's say you could freeze them however, I imagine their frozen "shelf life" to be next to nothing. Probably why pet food producers opt instead to preserve them in little cans... canned crickets, canned silkworms, canned snails, canned shrimp, etc... then again... I am not aware of the process they undertake before canning... they're possibly frozen first?? Couldn't tell you honestly.
[doublepost=1524635449,1524635035][/doublepost]If you put crickets in the fridge, NOT freezer, they will go into a coma like hibernation state but remain alive for over a week or 2. Returning them to room temperature will see them come back to life in a matter of minutes.
For people that keep pink tongue or blue tongue skinks that collect their own garden snails, you can freeze them solid in the freezer if you collect a heap after rain during the warmer months and want to keep some on hand for when they're scarce. Upon thawing out, they will come back to life and be as fresh as the day you popped them in the freezer. I regularly collect and freeze garden snails for a lady that lives at the Gold Coast who comes and collects them every few months for her pink tongues. By the time she's arrived back at the coast, they're all cruising around the container again.