Yes, you can have media purchased with more than one account on one iPod. However, note the following:
- Apps are locked to the account that purchased them.
- To update apps you have to sign into the account that purchased the apps. If you have apps that need updating purchased from more than one account you have to update them one at a time until the remaining apps were purchased from one account.
The 90 waiting period required for change accounts for iCloud purposes