I've found this video on Reddit where they pretend these are frozen fruit flies coming back to life... I didn't find any publication related to this specific experiment. Is this just a fake video?
Short-term freezing kills fruit flies. Long-term cryo-preservation of D. melanogaster is also not possible.
Per a publication of Koštál et al. (2016), long term preservation of insects is only possible for embryos, or larvae in diapause. Indeed, freezing is an effective way to kill adult fruit flies (source: Phys.org)
However, D. melanogaster adults show very weak capacity to enter reproductive diapause, and larvae possess absolutely no capacity for diapause Koštál et al., 2016).