What do you use for a spiny skinned animals?

It sounds like you might be asking about the term used for animals with spiny skin. That term is echinoderm.

Echinoderms are a diverse group of marine animals that include starfish, sea urchins, sea cucumbers, brittle stars, and crinoids. They are characterized by their radial symmetry, spiny skin, and a water vascular system that helps them move and feed.

Let me know if you have any other questions!