They probably are practicing the act of breathing my toad and frog tadpoles all started to do that shortly before their front legs appeared. once they get front legs fully then you could add a slopped rock on one side, just make sure the water is deep enough to swim in almost completely submerged, and shallow enough for them to sit up and breath! Good luck! Also, White's can usually climb very well as soon as they develop all four legs! make sure the lid is secure