These are very good picture books for children that are about Chanukah. I will add to this list as I find more.
Simon and the bear: a Hanukkah story by Eric A Kimmel
The menorah story by Mark H. Podwal
Hanukkah Bear by Eric Kimmel
The Count’s Hanukkah Countdown (from Shalom Sesame) by Tilda Balsley and Ellen Fischer