There are a couple of things to try when dealing with this issue. First press the power button until the power option comes up and restart the iPod. If that does not work hook it up to the computer and restore your device to factory settings. If neither of these work you will need to contact Apple and visit an Apple store or send your iPod in for service.
To unfreeze an iPod touch you can try to do a restart. To do this you must hold down the home button and the lock button at the same time and wait for the screen to turn black then show the Apple logo.