"Do humans not?" he asked, genuinely surprised. But then, he'd never had cause to be affectionate enough with a human to get to the point where they'd purr, so how would he know. "I would think you'd be even more likely to than a troll, being an actual mammal... but, yes. Yes we do. Most of the noises we make aren't really 'human', naturally."

At least, he didn't think so, he'd never heard a human hiss or chirp.