Yes Julie the Canadian money has nicknames! The one dollar coin is called the loonie and the two dollar coin in called a twoonie or tooney! They are called this because of the illustrations on the coins.
I call the two dollar coin "the one with the queen with the bare/bear behind".
Queen Elizabeth is on the front, a polar bear on the reverse.
I am sure I did not make this up myself!
At the end of a Canadian trip, I seem to end up with close to $10.00 in change. The pennies, nickels and dimes (sometimes even quarters) I can slip into usage here in Maine. The leftover loonies and twonies encourage me to go back to Canada!