NakNaks are stackable, mildly articulable figures made by Hasbro in the early '00s. All the figures were the same shape (although some had small hooks on hands and/or feet) with different images and could be stacked to make towers. There was apparently some kind of game that had overly complicated rules but it seemed that the primary goal was to stack them as high as possible. The Stunt Stackers were a line of NakNaks that came with accessories such as skateboards, rollerblades and snowboards. This skateboard has square wheels so it can be stacked upon and also tiny holes along the rails that fit into the hand hooks. This is not the dude that came with the skateboard but he is the dude that came with this skateboard when I found it.