I just rented up and toystory for me nephew and niece... they are downloading to my mac now... but when i went to download/watch on my ipod touch 5th gen they didnt show up :/?
You must move the rental(s) from your Mac to your iPod. Rentals can only exist on one of your devices at a time.
See "Can I play my rental on more than one device?" here for more details:
Retrieving data ...