piggy bank

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A child's coin bank shaped like a pig.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A small container, sometimes in the form of a pig, to store small saved coins in. Often the "bank" must be broken open to retrieve the contents.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a child's coin bank (often shaped like a pig)