Book 24 is...
Rock and Roll Tractor Troll
The old bridge troll finds something he likes even more than his shiny red tractor--a shiny red electric guitar! Rock and Roll Tractor Troll! The farm will never sound the same again!
This is a shameless cash-in sequel! All popular picture books have them; see Llama Llama, Skippyjon Jones, Olivia, How Do Dinosaurs... and of course, the Pinkalicious books. Silverlicious comes out this year people--Silver-licious. I have nothing against these books. If I ever have a runaway picture book hit, I too will milk it to death.