Crane poses are yoga moves:
A frog tuck, as I understand it, is mainly a gymnastics move that's taught as a progression to, among other things, planches:
Are they pretty much the same thing, just with different names?
I note that in the crane pose pic the persons knees are above the elbow whereas in the frog tuck pic they're below. From what I've read (writings by Christopher Sommer) a frog tuck is supposed to have the knees above the elbow so I figure the pic just isn't that great a pic.