Originally Posted by
Stanwell
You probably have a point there, FlightlessParrot.
The Grumman Duck would be a fair example of 'what do you call it'?.
Pregnant?
Seriously, the advantage of the US terminology is that, in that system, this is certainly a seaplane (and an amphibian), and then we can decide whether it's more a floatplane or a flying boat (but it had probably better make up its mind and have the operation).