Yeah, I see that, I am use to 17", 19.5" etc.....denoting MTB frame sizes, kids bikes look like a different animal altogether in that sub 20" range but I found 2.
http://www.ridleys.com/bikes/trek/trek-jet-16-0
But, but.... look at this one, 16" with front suspension, and pull brakes! That would be a good trainer for moving up to a real MTB. And Norco builds solid bikes.
http://www.norco.com/bikes/youth/16-...pion/scorpion/