Originally Posted by tartare
Really?
Tell us more... Google has only a few very short references.
Your google-fu is lacking - there's plenty out there.
Here's an article about Boeing in 1998, shortly after the late '97 merger with MD:
1998 | 2636 | Flight Archive
And another in 2000:
lockheed martin | 2000 | 1164 | Flight Archive
Seems Boeing renamed it the Advanced Theater Transport, but kept the Super Frog nickname for a short while at least...
What I remember about it was that it was a tilt-wing design meant to compete with the quad-rotor that Bell-Boeing was working on for greater lift than V22 Osprey.
When searching for Mcdonell Douglas Tilt Wing, many more hits - perhaps super frog was an internal nickname. I did find at least a small handful of hits for Boeing redesigning tilt wing and references to evolution to ATT...
I was actually at MD in St Louis the last day it was MD and they were taking the signs down...