Storm Over Warlock - Andre Norton - Bog

Normally, Shann Lantee, most menial of the Terrans attached to the survey camp on the planet Warlock, and Ragnar Thorvald, an officer in the elite First-In Scouts, would never had been friends, or even speaking acquaintances. Now, as sole survivors of the invasion of the planet by bettlelike Throgs, their only hope for survival lay in staying together and, if possible, finding the unknown people whom, Ragnar believed, existed somewhere on the planet. So, relentlessly pursued by the Throgs and their vicious Hound and imperiled by mysterious "urges" relayed to them through an odd round amulet picked up by Ragnar, the two Terrans plunge into a weird, menacing half-world whose delicate female leaders govern by thought control.