My ipod is stolen, will i be able to retain progress on games
Depends on the game. 

Some games store data on the phone that is only recoverable from your backup, if you have one. 

Other games/apps store data on the developer's servers and will be available when you sign back into the game or Game Center on your device. 

For the Game "Clash of Clans" the save progress is matched with your Game Centre account.