What is a group of cougars called?

There isn't a specific collective noun for a group of cougars. While other animals like lions have "pride" or wolves have "pack," there isn't a widely accepted term for a group of cougars.

Some people might use the term "litter" to refer to a group of young cougars, but it's not as common for a general group of cougars.

You could also use general terms like "group," "cluster," "herd," or "congregation" to describe them.