Is a bottle of white wine still good after having frozen?

You can still drink wine after it has been frozen, it will thaw pretty quickly.

As long as the cork has not been forced from the neck of the bottle you should be fine. If the cork has come up than drink it as soon as it has been thawed.

If the bottle has cracked don't drink the wine you might be drinking glass.

Beware of sparkling wine, because it is carbonated and there is extra pressure from the expanding water molecules. This wine should be thawed in a sink or bathtub with a towel over it just in case.