Any way to retrieve lost iPod photos?
If you didn't back up the photos, they're gone, sadly.

If you connected the iPod to the computer, iTunes may have backed them up without you realizing it, So check there first.

If you enabled iPod backups, you can send iPod on any other device and manage the storage to see if the iPod has a backup. If so, you can restore that back up on to pretty much any device.