What is the collective noun for a group of cocoons?

There isn't a commonly used collective noun specifically for a group of cocoons.

However, you could use descriptive terms like:

* A cluster of cocoons

* A nest of cocoons

* A mass of cocoons

* A collection of cocoons

You could even get creative and use a more poetic term, like a tapestry of cocoons. Ultimately, the best term depends on the context and the desired effect.