Maybe it's just me, but I find the Swedish "mörtskalle" to be a much better insult than the original English "spongehead" in Freddi Fish and the Case of the Missing Kelp Seeds.
"Mört" just sounds a lot funnier, and since it translates to "[common] roach head", it continues what I'm now going to declare to be a tradition of fish-based insults that goes back to at least #ManiacMansion.

