"Piggy" is a word used to describe something related to a pig or resembling a pig. It can also be used to refer to a small or cute pig. Full definition
Sure, it won't be enough to retire on, but good - quality photographs or illustrations can turn into a nice little piggy bank after just a few weeks. (littletechgirl.com)
With endless ways to wear one item, we will have more money to place in our little piggy bank. (fashiononthe4thfloor.com)
You'll bond with them as you put coins in piggy banks, use toy bills to explain savings accounts and decide which snacks to buy at the supermarket. (ovationcredit.com)