Boo! Books are back at Wendy’s! For one dollar, customers can purchase the Boo! Books, which include five coupons for free Frosty Jr.s. Boo! Books are available at participating locations now through October 31. Customers will be able to redeem Frosty Jr. coupons until December 31. Proceeds support the Dave Thomas Foundation for Adoption, which helps find families for children in foster care.