These are the realistic avatar babies made by Spain-based realistic baby maker Babyclon. They're made entirely from silicone, cost $2,000 apiece, and are super creepy. I included a video of somebody playing with them in case you weren't sure. Honestly, I don't even know where to begin, so I guess I'll start at the very beginning. You see, when one Na'vi loves another one very much... "Go on." I can't, that's actually all I know about babies, my parents said I'm not ready for the talk yet.
Keep going for the video.
Thanks to Julie Ann, who informed me Pet Rocks are actually all Golem babies taken from their parents and sold to the pet trade.