Will the Musky Hunter App work on an iPod?

Yes, it will work on any of the iPod Touch models.  Keep in mind that the Musky Hunter App leverages a live data feed, so in order for it to function properly for you, you'll need to connect your iPod to a WIFI network.  For example, if you are at a canadian fishing resort, and they provide wifi access, you can sync your iPod and take it out in the boat with you.  The data will be loaded onto the iPod, so it will work as designed.