Sweds

Two-faced humped creatures found on open plains and near rivers. They say if you rub the hump of a swed at full moon, it will bring you good luck for a month.
Swedhump Elementary is named after them.

The three most common kinds are:

Grinning sweds: Mischievous. Collum Ollum once had one as a pet.
Grumpy sweds: The nicest kind. Friendly and sweet.
Smiling sweds: The smile is deceptive – they do actually bite.