Q: Photos and Camera taking up 5.6 GB with only 130 photos - iPod 6th Gen iOS 9.3.4

Connect the iPod to your computer and look at the storage used by the various categories as shown in the colored bargarph in iTunes.

Come back with the results.

An "other" larger than about 1 1/2 GB indicates corrupted files.

What is the Other on my iPhone and How to Remove It

https://www.imobie.com/support/what-is-the-other-on-my-iphone.htm

What is "Other" and What Can I Do About It?

Reclaim "Other" storage space on iPad, iPhone and iPod

http://www.appducate.com/2013/01/reclaim-other-storage-space-on-ipad-iphone-and- ipod/

Next, usually restoring from backup eliminated the corrupted files. However, sometimes restoring to factory settings/new iPod is required.

To restore from backup see:

How to back up your iPhone, iPad, and iPod touch - Apple Support

To restore to factory settings/new iPod see:

Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support

If excessive "other" is not the cause then try the Restores discussed above