The celebratory Christmas-themed rolled, frosted cake is called a "buche de noël", a Yule log.
It comes in many flavors, sizes, colors, and options.It is a fancier, dressed-up, high-quality Twinkie. (I'm guessing. I've never actually tried one, except maybe in French class in the US, so that barely counts.)
The tiny sizes are called "buchettes", loglettes.
This post's theme word is yare, "easily maneuverable, nimble," or "ready, prepared." The logs for Yule are yare. Yare Yule logs, come and get 'em!