Darth Tater isn't just from that movie. It's a real product (created separately, and, I believe, first). It's an officially licensed cross between Star Wars and Mr. Potato Head, put out by Hasbro. You can find it (among other places)
here. As for Store Wars, there's another thread about it below. It's currently about half a page down on the topic listings, but the direct link is
here. Paul