Nope, it doesn't make any more sense the second time around, now that he's actually listening. Riddles are not his thing, and thank Eywa it's not a thing with the Na'vi either. Trying to figure them out in English is tough enough.

Jake's ears lay back in frustration, both at the riddle and this damn snowbank. Five headed creature, okay, maybe fingers or toes? Full-blood Na'vi only have four on each hand or foot, but Jake was raised human and his avatar body has the normal human amount. The second line loses him right away though. Who carves rock with their fingers? And how would hands or feet guard against getting into trouble? Kinda the opposite, in his experience.

"You sure don't make this easy, do you?" Right, okay, might as well take a stab at it instead of just plain giving up at the first hurdle. "I dunno, fingernails?"