A Wreck of Dragons - Elaine Isaak - Bog

Teens and their giant robots search for a new home for mankind, but the planet they discover belongs to the dragons.
Two hundred years after the Climate Wars left Earth uninhabitable, Johari and his giant robot companion lead a squad of scouts on a quest for a new Goldilocks planet to settle the remnants of the human race.
When one of the scouts and his bot go down in a hostile wilderness, Johari's fight to save them reveals complex behavior in the dragon-like dominant species. The scout team fragments as Johari strives to rescue his friends and discover the truth about the aliens.
If he's right, mankind will lose its best hope for a home - or sacrifice its own humanity.