E. Everett Evans 
Alien Minds [EPUB ebook] 

Were you looking for a roch, nyer? An oily voice spoke up just by the elbow of George Hanlon. ‘I have some excellent ones here, sir.’ ‘Yes, nyer, I want several, if I can find ones to suit me, ‘ the young man replied. Nor could anyone, glancing at him, know he was not a native of this planet, Szstruyyah, which the Inter-Stellar Corpsmen, in self-defense, called ‘Estrella.’ For the cosmetic-specialist who handled the secret servicemen’s disguises had done a marvelous job in transforming the blond young Corpsman into an Estrellan native.