Hello! Is there any app where you can find the history calls on facetime for the past three years?

FaceTime call logs are saved in iCloud or iTunes backups. If you have one from when the calls in question were placed/received, you can restore it to the iPhone to get the call logs: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support. Restoring a previous backup will replace everything currently on your iPhone with only the items that were on the phone at the time the backup was created. Nothing added to the phone since then will be available, so I would recommend making an updated backup before restoring an old one: How to back up your iPhone, iPad, and iPod touch - Apple Support. Once you've got the data you need from the old backup, you can restore the newer one to bring yourself up to date.