Can the sponge layer be made ahead of time and frozen?

I made that yule log for Christmas and everyone loved it. I baked the cake a week before Christmas. I took it out of the oven, turned it on a tea towel sprinkled with icing sugar, removed the parchment paper and rolled it with the help of the towel then let it cool in the towel overnight. In the morning, I prepared the mascarpone filling, unrolled the sponge and spread it on then rolled it again with the help of the towel.I kept the cake wrapped in the towel while I prepared the ganache and let it cool then,I placed it on a cardboard and spread the ganache on the roll and made it look like bark. I put it uncovered in the freezer for about 45 min to firm the icing well. I then wrapped it in Glad Cling wrap and back in the freezer overnight. In the morning,I bagged it and back in the freezer. On Dec 24TH, I removed it from the freezer, put it under a cake cloche in the refrigerator to thaw. On Christmas day, I let it come to room temperature and garnished it with meringue mushrooms, almond paste and almond slices pine cones and a sprinkling of icing sugar. It tasted very fresh and was very moist. I will probably repeat this technique next year but I may do it even earlier in December.

Not very well. It's really important to roll the sponge while it is still warm. If you freeze it and thaw later, I'm afraid you won't be able to roll it without it breaking.
I've never tried it, but I've made many a Buche, and sometimes it's hard to roll it uner the best of circumstances.

For breaking up the steps and making part ahead of time, in the comments of the recipe Picholine recommends: "Here’s a tip: make cake and fill, wrap in parchment and foil. Freeze. Then remove the day of serving, make ganache and decorate. Chill before serving in fridge."