According to Amazon, the SCOOB! film will have several novelizations released, including "Those Meddling Kids" (w/free card deck), "A Dog's Best Friend," and another TBA novelization, all coming April 7, 2020. A "Best Friends" Activity Book will also be released that same date. Another unrelated book, Scooby-Doo and the Pirate's Treasure will be released by Golden Books, also on April 7. Thanks so much to ScoobyAddict for the info!
Below are the covers to each of these: