Maybe {{A Wizard's Guide to Defensive Baking}} by T. Kingfisher
If you want an actual book to hand him, my kids absolutely loved the graphic novel Dungeon Critters by Natalie Riess. I bought it for a road trip and they read it multiple times.
Popular alternatives to
Dungeon Critters
Harry Potter and the Philosopher's Stane (Scots Language Edition) (Scots Edition)