I have five points like a certain shape I live underwater and not the surface Unlike my name I’m related to sand dollars

Tiny architects in red uniforms, marching in line, building fortresses from grains, endlessly working, never a strike or vacation.

Can you feel the claws digging into your tongue? Oh wait you can't talk right now...

I move in deep cover, work in the dark. Espionage, or a beautiful mark?

I'm massive and gray, with a memory so bright, My tusks are my pride, in the savannah's light, I roam with my herd, with a trumpeting sound, My wrinkled skin's tough, but my heart's soft ground.