After hearing a "leapfrog competition" mention in Gerstner’s book, I did a phrase search in Amazon. Apparently he uses the phrase once, as follows:
(p. 159) This doesn’t mean it wasn’t a good transaction for AT&T. It allowed AT&T to leapfrog its competitors. But for IBM it was a strategic coup.
The book is:
Gerstner, Louis V., Jr. Who Says Elephants Can’t Dance? Leading a Great Enterprise through Dramatic Change. New York: HarperCollins, 2002.