Unser Fritz Falls is one of the few named waterfalls you might spot while glacier walking on the Franz Josef Glacier. You might have a hard time picking out this waterfall, especially if it has been raining (which was the case when I saw it) because there will be literally dozens of other waterfalls in the area. This is probably not a waterfall you would bend over backwards to identify, but I did notice it appeared to be one of the more prominent ones on the east-facing wall.
For more information on this waterfall such as...
maps
directions
detailed descriptions
refer to A Guide to New Zealand Waterfalls (Story Nature Press).