1. Polypodia: This refers to a group of cephalopods, specifically octopuses, squid, and cuttlefish. These animals are characterized by their multiple arms (or tentacles), hence the name "polypod" (meaning "many feet").
2. Polypody: This is a type of fern. It's not an animal, but a plant.
To understand which "polypod" you are referring to, you need more context.