https://www.bbc.com/news/health-11389464

Just the fantasy of the life-extenders that if they figure out this one weird thing they will live forever. The body can be temporarily suspended, depending on the complexity of the creature this can be a very long time, frogs for instance can do it for weeks or even months.

https://www.latimes.com/science/sciencenow/la-sci-sn-alaskan...

The big differentiator is whether or not the water in the cells has crystallized or not, if it does it will rupture the cells and then it is game over no matter what. Other than that it is mostly a roulette game with very high stakes.

There are lots of papers on frost damage to cells, too many to list here but easily searchable.