Alright, so Eugene Levy keeps calling Dory "kelpcake." But in the first one, someone says that doing something easy would be a "piece of kelp. "
This implies that cake and kelp are analogous. So either A) Eugene Levy is calling his daughter "cakecake," B) kelpcakes are often abbreviated into "kelp," i.e. "Coke", or C) this bothers me way too much.