I am assuming you have a jailbroken ipod. If your ipod touch is not Jailbroken you cannot install cracked games.

I have found a lot of ipod/iphone games on BCG. BCG is your best bet. However if you got a wifi connection install installous through cydia. Installous is a little app which allows you to browse through a lot of cracked games download them and install them on ipod itself. I prefer installous over BCG.