The one on the bottom on the right is apparently in Chicken Alaska? I have no idea what it is and I dont have a larger picture.
The name "Otter" was given when the company built them changed the name about thirty years ago, don't know what they were called before then.
Ranger, Ferret were the other names they use the drive train from a lawntractor " economy, Jim dandy " 3 speed transmission rear end
steered by brakes on the differental. rough ride on frozen ground. Tip over easy.