What is the collective noun of pop corn?

There isn't really a widely accepted collective noun for popcorn. You could use some creative options like:

* A bucket of popcorn

* A bowl of popcorn

* A heap of popcorn

* A cloud of popcorn (especially when it's being popped)

* A shower of popcorn (if it's being thrown)

Ultimately, the best way to describe a group of popcorn depends on the context!