this is a lot to respond to
1 frog don't actively sleep it is more like resting and the eyes are open for safety purposes no zzz required cuz no sleep
2 one thing for the reeds is once something touches a reed, it sways then goes to normal until it moves again
3 the issues for the on-land could be fixed with it checks if left and right are possible jumping locations then have the frog jump away first if that isn't possible then jump towards repeatedly till past the cursor and back to safety
4 its not tunnels in a sense but the top layer of decaying leaves and pine nettles look like the bottom and isn't very dense so they go down and hide lower neer the true bottom of the pile of stuff so just make the frog disappear
1 keep life cycles out there boring
2 fros are silent during the day with very few strokes but at night there is a loud chorus of croked
3 yes the occasional bubble comes out either from a frog or a plants oxygen
4 frogs are either at the surface of at the bottom and the swimming is fast and torpedo-like
for plants just add some black and dark gray leaf mush mixed with black and dark orange pine nettles it will look like a sloppy mush. and add grasslike bushes.