money box vs savings bank

money box

noun
  • A tin, often with a slot in the top, for depositing coins, used by children to save. 

savings bank

noun
  • A type of financial institution that focuses on retail banking: savings of private depositors, payments, credits and insurances for individuals or small and medium-sized enterprises. 

How often have the words money box and savings bank occurred in a corpus of books? (source: Google Ngram Viewer )