What is the noun of squashed?

The noun form of "squashed" depends on what you're referring to:

* If you're referring to the act of squashing: Squash

* If you're referring to something that has been squashed: Squash (as in "There was a squash of fruit at the bottom of my bag") or Squashed thing (more specific).

For example:

* Verb: "I accidentally squashed the bug."

* Noun: "The squash of the bug was disgusting."

* Noun: "The squashed fruit was unusable."

The best noun will depend on the context of your sentence.