What is a heap of monkeys called?

There isn't a specific, widely accepted word for a heap of monkeys. It's more likely you'd describe them using words like:

* A troop of monkeys (the most common way to refer to a group of monkeys)

* A bunch of monkeys

* A horde of monkeys

* A crowd of monkeys

If you're talking about monkeys in a more specific sense, like a large group of monkeys all in one place, you could also use:

* A congregation of monkeys

* A gathering of monkeys

* A mass of monkeys

Ultimately, the best way to describe a heap of monkeys depends on the context and the desired effect.