Thumble Tumble and the Ollpheist
I was sent this book a while ago and shamefully it has taken me this long to read it (sorry Angela). But, in all honesty, it was worth the wait.
This is Thumble Tumble and the Ollpheist written by A. H. Proctor.
Are you into fairy tales? Legends? Mythical beasts? This book has it all, in a lovely compact little package.