Kinder Happy Hippo is a cookie/candy made by Ferrero SpA, the same company that makes Nutella, Kinder Surprise and Tic Tacs, among other candies.
The candy itself consists of a wafer biscuit, shaped like a hippopotamus. Inside are two flavors of icings. In the original, one is milk flavored and the other is hazelnut flavored. In the cocoa flavor, the hazelnut has been replaced by chocolate paste. The bottom of the wafer is dipped in a frosting/meringue mixture and is crumbly.