His knife is similar to the Aitor Jungle King II but not quite. The pictured knife is currently part of another "survival" knife set known, in its various incarnations as Adventure Survival 12-piece Deluxe Knife Kit: http://www.amazon.com/Adventure-Survival-12-piece-Deluxe-Knife/dp/B000VMGAZG#moreAboutThisProduct. Unfortunately, I can not locate a specific manufacturer for the knife itself, identified as a "harpoon."

There are a couple of others like the "Hoffman Harpoon" (large and small versions) and Coldsteel's "Bird & Trout". Here's a review and comparison between the two: http://hikinghq.net/forum/showthread.php?t=2104