I've made the drive from Frankfurt a few times. Rental cars will be on snow tires and the roads are maintained well, the drive will be easy. Hotels are silly expensive though, book in advance and if you're going for a few days do an Airbnb or VRBO, nice to have a kitchen and such.
Be aware that Chamonix is absolutely huge and you can ski between hills quite easily and need to get a ride back to the main area. Probably easier with smart phones and GPS, but when I went it was easy to end up miles away from lift access and not have a good way back.
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