I think that can't be answered categorically like that. Some species can survive being completely frozen, like the wood frog, others can't. Interestingly, there are also some mammals that can survive extreme cold, the arctic ground squirrel can survive a core temperature of below 0°C

I guess it's as doctors say: "You aren't dead until you're warm and dead"

Cold blooded means their body temperature relies on an external source. It doesn’t mean they don’t need to have warm blood. Without an external heat source they become hypothermic and will eventually die.

Ianab, but I would say yes. Even more easily actually since they have weaker thermal regulation. The notable difference to so called warm blooded animals is that there isn't a separate circulation to head and brain and the associated 4-chamber heart.

Maybe someone can confirm or refute or give better information on what exactly is hypothermia and how the effects would differ. I'm just reasoning based on elementary school biology.