Storm Over Warlock by Andre Norton

Stranded on the unfamiliar world of Warlock, Shann Lantee's expedition camp has been wiped out by the Throgs, beings so alien that humans have yet to communicate with them. And so Lantee was left alone and weaponless in the strange, hostile world, becoming the human prey of the aliens. Lantee must quickly learn how to survive under harsh conditions while being chased by the Throgs - and how to distinguish the real from the dreamed when he meets the mysterious Wyverns.

You can view more about this title at the CruGuru website. It is available from Amazon.com. ISBN: 978-1-920265-24-3