The blueberry is the one of the three food sources on the island of Tinkatolli. Blueberries are found in areas plentiful in grass and are healthy and nutritious. Don't eat a tinkaburger. Go for the healthy option. Eat a blueberry.
If you don't eat every now and then your Tinka will get hungry, so make sure to feed it!
Before Open Beta, blueberries were the only food found in the game. Now you can find Lingonberries and Wild Strawberries