I want to delete gamepidgeon but it won’t let me.

When you attempt to delete the app from your home screen or a folder, what happens?

Have you tried going to Settings > General > iPhone Storage > GamePidgeon (after list of apps loads) to attempt to delete the app there?

As an alternative, if you're simply trying to update the app, have you tried attempting to download it from the App Store while signed in to your own Apple ID?

When dealing with apps that were "purchased" or downloaded using a different Apple ID than your current one, issues arise regularly because they are still attached to the old Apple ID. That's likely what's preventing the update from being able to be authenticated.