There are many collective nouns for groups of crabs, but the most common is “a cast of crabs.” Other collective nouns for crabs include:
- a clutch of crabs
- a congregation of crabs
- a mess of crabs
- a pod of crabs
- a raft of crabs
- a scuttle of crabs
- a shiver of crabs
- a swarm of crabs
The collective noun “consortium of crabs” is also sometimes used, but it is less common.
The type of collective noun used for a group of crabs can vary depending on the species of crab, the location, and the context. For example, a group of fiddler crabs might be called a “ditty,” while a group of hermit crabs might be called a “colony.”
Ultimately, the best collective noun to use for a group of crabs is the one that sounds the most natural and appropriate in the given situation.