What is the collective noun of whales?
A pod of whales
The most common term for a group of whales is the pod, however other labels used include a gam, a herd and a plump of whales. These terms come mostly from medieval records on hunting lists of animals, some of which have stayed in the english language (a pride of lions, a school of fish), while others have fallen out of common usage (a clowder of cats, a paddling of ducks).
I hope I have helped!