School, or shoal.
Piranha , Gar ,
A group will devour anything that comes in their way.
An adult anaconda will eat a piranha if it is a small group. A very large group would be too dangerous.
There have been five movies with piranha in the title: Piranha (1972), Piranha (1978), Piranha Part Two: The Spawning (1981), Piranha (1995) TV, and Piranha (2010)
how many is in the group and what are their names?
Piranha's generally occur in small groups of about 20
A collective noun for a group of names is a list of names.
There is none, generally the Red-Bellied Piranha is the "regular Piranha"
a christmas piranha
No a piranha does not have a shell!
in the piranha kingdom