ST-PLAH

You may not have heard of this obscure humanoid, which feartues in the legends of the Indians of the North-West.  It is regarded as a giant, of solitary bent.  A st-plah is said to make its home at the bottom of a body of water, such as a pond.  It would steal the surprised passer-by.  Then he makes him inoto a servant or he eats him.  Neither fate is congenial.

Pedestrian confronted by a st-plah