"The Chocolate Chip Starfish was among the first animals to achieve a formal scientific name, having been named by Linnaeus himself in 1758. It has several common names, being known primarily as the Chocolate Chip Starfish among aquarists but often as the Horned Starfish in the scientific literature and natural history books.
It is a member of the starfish family Oreasteridae, a group of starfish consisting of stout species with short, thick arms. Other members of the family are sometimes traded as aquarium specimens; these include the Red-Knobbed Starfish Protoreaster linkii and various species of Pentaceraster, sometimes called Knobby Starfish. Their aquarium care is similar to those of the Chocolate Chip Starfish, so much of what is said here applies equally to these starfish as well." link

(Also, there's an EDIBLE chocolate chip club at: link)