The most likely place for information on these falls is the Parks office in Queenstown, so I phoned them.
I spoke to a pleasant lady who has been in the Queenstown office for 16 years - she is aware of the existence of these falls, but us unaware of any other detail - she cannot recall anyone visiting them, and is unaware of whether they are named.
She did say she'd be prepared to hunt around for further information if I liked - so if you're really keen you could always call...
http://www.parks.tas.gov.au/index.aspx?base=7710#18Or use their online enquiry form to ask, perhaps?
http://www.parks.tas.gov.au/index.aspx?base=5979Be aware to anyone reading - off-track, remote areas, likely in thick scrub. Like, over the road (or thereabouts - within 4 km or so) is Victoria Pass - the bush bash down from Raglan Range to Victoria Pass was pretty tough going 19 or so years ago, and it's grown a lot since then, so I reckon the forest around these falls would be quite something.
Interested to hear how you go!