This is as simple as unlocking an iPhone and iPad, you can do it. First, you can log in to Apple's official website to find some official methods. He may give you some ways to use iTunes, and if you have a backup, it's perfect. If not, you have to go through a complicated unlocking process. Second, if you can't use iTunes and recovery mode, this may be your last choice for unlock iPod Touch without password: https://www.fonecope.com/unlock-ipod-touch-without-password.html