The Aggressive-tribe Ettin breed was created by Sandra Thurman, aka Ettingirl, for C3/DS using the C3 ettin and grendel sprites. The Aggressive-tribe Ettins are said to be extremely dangerous. They instinctively attack any creatures except other Aggressive-tribe Ettins. They are good breeders, have a grendel instinct to hunt down norns, so KnyteTrypper suggests downloading some edible critters, which is the main source of food for these ettins.
Also, these ettins never hit the hand - they push or pull the hand, but never have they hit it. When bored, they steal food and store it in the Desert Terrarium. So if you start running low on food, look there.
The Aggressive-tribe Ettins could be downloadeded from Iggdrasil.