Their called schools of fish. Yes
Neither are wrong terms for describing multiple dolphins. Multiple terms have been thrown around for both dolphins and whales, trying to emphasize the fact that they aren't fish, but none have ever been selected as the official term.
Pack
in a pack
A pack of wolves.
There is no certain leader. They swim in schools because its hard for a bigger fish to catch all then just one.
A pack of Mongooses is called a Flock.
a pack of dogs is called a kennel
I got the "Funky Bands" pack called "love" and it has two of each a cross, a bible, a fish, a heart, a dove and one that I'm not quite sure what it is exactly... i hope this helps
the name of young timber wolves are called pups
A colony or a pack.
a collection of fish is called a school of fish