Jake's used to hearing hesitant English, though the accent's a bit different, and for a moment he's tempted to try speaking Na'vi in case that's easier. But fur and horns means that's probably a long shot, and they've already got one language in common for sure. So he just puts on a friendly smile and lightly touches his own forehead in the traditional Na'vi greeting. "I'm lookin' for cold weather gear. Parka, gloves, probably a hat or somethin'." It'd be embarrassing to come back to Pandora with frostbitten ears, after all.