So after a lot of hair pulling, curses etc, we created a hypoteses about why our frog would be invisible on our devices but not on the desktop application. I made a debug where we finally saw that the frog actually fell through the bounds of the screen. I believe it is because the frog is created before the ground, and falls through it before the ground is created!
The fix will be to create a start state so you must push the screen for the game to start, this will probably solve it. Hopefully that is the problem!
over and out
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Yep that was the problem, bug resolved.