Well, the reason I call it a pancake is because in my mind, a flic-flak involves the kite becoming completely inverted, while a pancake involves the kite simply going flat (parallel to the floor). Plus, I have heard other people call it this.
Most things I don't really know the name to, so if I don't know the name, I just make it up. Like the pancake catch and axel catch, I just made up the names. I know, I know I'm pretty clever and original XD