In the Netherlands, they are called bakfiets (bach-feets), the plural is bakfietsen. They are huge overseas. Check out this footage of them outside a local zoo.
I especially like all the child sized seatbelts. I don't know how these would play out here unless there emerged a real bike friendly trail system, but I would love to find out. Here's an example of how family-friendly they can be.
Sleeping babies, how cute!