Ettins are a species in the games Creatures 2 and Creatures 3.
Ettins were created by the Shee to help them on their experiments, especially when using machinery. Unfortunately, they made them like machines so much, they tend to steal bits for themselves, often taking them to wherever they consider their home.
C2 Ettins behave rather differently; they tend to lead a sad and lonely life underground with no one but Pitz and the occasional Grendel for company. The backstory in the guides and manual, as well as the opening sequence, reveals that they once lived in the desert at the top of Albia and, true to their nature, built the pyramid that sits there. The actual use (if any) of the pyramid is unknown.
Ettins were introduced into the Creatures universe in C2, having been revealed to the world after the volcanic eruption.
The Ettins in Creatures 2 were infertile; however, in Creatures 3, there were two Ettins aboard the Shee Ark at most times (both female), and it was possible to get them to breed if two of them were placed in the Gene Splicer machine to create a male Ettin.