https://www.history.com/topics/christmas/santa-claus
If you're going with the traditional American Santa and reindeer https://www.amazon.com/Santas-Story-Will-Hillenbrand/dp/1542043387/ref=asc_df_1542043387?mcid=5ea6280c436238179d5b156abf588549&tag=hyprod-20&linkCode=df0&hvadid=693294851223&hvpos=&hvnetw=g&hvrand=8503679737291462636&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9009739&hvtargid=pla-818191969858&psc=1 this looks like a good one about Santa finding his reindeer ( it's for ages 3-7, so definitely a read aloud book but keep at a distance since it's a traditional book with words and pages ( older toddler to school age) type of book)
https://youtu.be/fjSsezjsJ1E?si=xc7vuTPvC61h2mgD for a more modern ish reading of twas the night before Christmas ( Eric Holloway, that bass voice)
https://youtu.be/HInx6eCgjfY?si=Kj0txFWpmbRgQvfW a more traditional reading, from another bass singer on YouTube who has done some readings, Geoff castelluci
In addition to books, if you allow screen time, I started playing the ms. Rachel Christmas episode and after two times, my son was saying “ho ho ho” when he sees Santa lol
Santa claus as we as Americans know is an amalgamation of several different characters. *Cracks knuckles* Here's a deep dive long giant info thing on the history of Santa Claus, based on sinterklaas of Germany, who's design we are most familiar of was definitely also inspired by the father Christmas figure of Germany with his fur trimmed robe