Maybe. I've heard it from people from Watertown, NY to Burlington, VT all the way down to Fort Lauderdale. They seem to think they know a Canadian when they see/hear one - especially when they pull the toast and hot water trick. They could be mistaken, I suppose.
Though it's sort of hard to mistake them when they pull up into (or out of) the lot with Quebec/Ontario plates on their vehicle.
I realize that to Canadians their quarter is real money, but to Americans it is essentially a slug.
It's approximately the right shape and size and color, but no bank will take it (not as a quarter) and no vending machine will take it.
You can't unload them on the locals because they're looking out for them, etc.