Cute...yes...cute like a baby whale! Yes, definitely that is a vlamingi tang. (Naso vlamingi) Assuming that you don't starve him, he will be 10" within 8 months.
All the Naso tangs are sometimes referred to a unicorn tangs. This is because some of them develop unicorn horns (Naso unicornis, for example). N. vlamingi is also called the "humpnose"...while they don't get a horn, they do develop a rather bulbous nose.
Feb, 2008 (1-2")
Oct, 2008 (10") (This shot also happens to show N. elegans and N. unicornis in the background left and right)
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436