As with all Japanese cities, the most famous souvenirs of the area are all gathered in the airport and train station. The MOO is also a good place to buy souvenirs and food.
Though logging is no longer as big of an industry as before, wooden carvings remain a popular souvenir. Carvings in Ainu designs are also common.
Akan's cheeky Marimokkori mascot also makes funny souvenirs. The character is based on Lake Akan's famous marimo algae, and features a prominent crotch lump "mokkori" is Japanese slang for such a protuberance in the crotch area. You can find on all manner of merchandise.
Edible products include Kujirasuku, a dark chocolate-soaked biscotti-like biscuit that does not contain any whale contrary to its name and logo, and many types of commemorative cookies and sweets. Of course, there is also all manner of seafood and you can buy your own steamed king crab in a box if you'd like.
