The Atavist Ettins were created by Snapdragon for C3/DS using the C2 sprites (atavism means 'reverting to an earlier form'). Their personalities and behaviour are much closer to the C2 Ettins. They prefer gardening to carrying bits of machinery around, breed more slowly and live longer lives.
The Atavist Ettins can be downloaded from The Wyvern's Lodge. A CFE version of the genome is available at Creaturetopia.