Starks are water to land monsters that can sprout legs to charge after their prey. Without arms they have to bite at their foe to defeat them. They can come in many different colors and sizes. Their name comes from what they do (stalking), what they look like (star shaped), and their resemblance to (earth)sharks.
These are some pretty funky and colourful sharks. I bet it is to deceive unwary adventures that are confused by their bright and cheerful colours and smiles.