>>Like anything there would be a limit to how low temperatures can get before the toad suffers fatal consequences.

In theory at least, this is not quite true. the reason freezing is fatal is the nasty habbit water has of forming crystals that are not only jagged, but take up more space that liquid water, bursting cell walls and fracturing proteins and DNA. If there were a way to make water go through a smooth transition from a liquid to a non-crystaline solid (say by adding some as yet undiscovered impurity), it might be possible for living things to truely freeze and survive. I say "in theory" because this might simply be chemically impossible, but I don't think anyone's proven it yet.

Of course, there's always a chance I might have read some "consumer science" somewhere and this is known to be impossible...

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