This was actually a tough holiday to find great books for toddlers! Hence why the list is so short!
The ones we did find those, are great. The girls LOVED them. & we can't wait to catch our leprechaun! 
I do wish there was a movie/episodes about St. Patrick's, if anyone knows of any please let me know! 
I love having the girls learn early the history & fun with each holiday!
Info on each of the book below!!
1. Horray for St. Patrick's Day!/Joan Hulub {fun flaps on this one!}//St Patrick's Day Shamrocks//Mary Berendes {this is more educational/informative// The story of the leprechaun/Kathern Brown Tegan {LOVED this one}//That's What Leprechauns Do/Eve Bunting {this one had us laughing so much!}//There Was An Old Lady Who Swallowed A Clover/Lucille Colandro