Now isn't this just a lovely thing to have around for the kids? I wish I knew the original source of this picture. It looks like something you may be able to purchase at Etsy, although the human teeth may make it a limited edition toy. It's part of Buzzfeed's collection of 22 incredibly creepy toys, which will give you the willies. Noticeably absent: Furby. Link
Update: This toy is a Fuggler from the Etsy store cathairandteeth, run by British artist Mrs McGettrick. It has been sold, but she has plenty of others! -Thanks, mikerbaker!