What is the group of a true starfish called?

There is no specific group name for a collection of true starfish. However, you can use general terms like:

* Group: This is a general term that can apply to any collection of animals.

* Cluster: This term could work if the starfish are clustered together in a specific area.

* Aggregation: This term implies a collection of organisms that are gathered together for a particular purpose.

* Population: This term refers to a group of individuals of the same species living in the same area.

While there is no formal name, "group" is a safe and easy-to-understand option when referring to a collection of starfish.