Answer: I think you are right that the callas will not have survived if they have been outside and frozen. If they froze, they will probably be rotten. Whether or not that could affect your other bulbs is hard to predict. I would expect the other bulbs to be rooted by now, so it is probably better to leave them undisturbed because if you try to dig them up, you risk damaging the roots. If on the other hand you kept them chilling in a garage or other cool but above freezing location, the callas might actually still be alright. So much of gardening is trial and error, at least this will be an interesting experiment. I hope your other bulbs do well for you!
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