How do I find Messages App accidentally removed from MacBook Pro

Hi,

If you removed message.app from the Dock, there is still message.app at Application folder.

If you deleted /Applications/Message.app, you need to reinstall macOS with Recovery mode.

Intro to macOS Recovery - Apple Support

If you have TimeMachine back up, you can restore message.app with it.

"How do I find Messages App accidentally removed from MacBook Pro"

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Lost the App?

Reinstall the macOS:

Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support. Important: Be certain to create a backup of your Mac prior to all of this. That way, you can have something to restore from the Mac from, should anything go wrong with the reinstall.