Krona

A gentle dragon, Smooka, is lured deep into a planet-wide cave system, where he takes an epic journey with a princess dragon to her domain, now under a glacier. Deep under that ice, the pair fall in love and discover ancient secrets that foreshadow the coming of humanity. Many dragons have put themselves into a glacial-age hibernation and they will later awaken either to destroy humanity's chances or to be its salvation.

"I love this story. The dragons very quickly became real people to me. Smooka grew from a faintly ridiculous blunderer into a wonderful hero. This is one of the most imaginative, delightful books I've read in a long time."
Dr. Bob Rich