Hello! This feels like a long shot in more ways than one, because not only is my memory of the book very hazy, and remembered details limited, but the book itself is possibly from outside of the time period listed on your website. All I remember of the book is as follows: I read the book some time between 2008 and 2012 (this may be around the time the book was published, but I dont remember) at my local public library, the main character was a once proud dragon who had been magically transformed into a dragon, and there is a scene in the book where he holds logs in his arms for several hours as a test of endurance. The remaining details I can recall are all ambiguous, I remember at some point there being a large abandoned castle made of either ice-like crystals or crystal-like ice, I remember there being a large tree that some people(maybe elves) lives in, and I remember a fantasy world map at the front of the book.
Lost Classics of Teen Lit: Name That Book! 