You'll scale over the broken wall to your right to quickly reach the other side.

You decide that the wall looks stable enough and low enough to reasonably scale. Large chunks of the wall have broken off and are scattered around the ground, and further up there are enough cracks in the stone to grab onto. So long as you are careful not to dislodge any stones, it should be possible to make it over the wall without drawing the frog's attention.

You start slowly scaling the stones piled up around the hole in the wall, then you carefully dig your fingers into cracks and crevices in the wall. After a little climbing, you've got a solid grip on the very top of the wall - you are so close! Just as you begin pulling yourself over, the stone you're standing on slips out of the wall and clatters to the floor! You slide down the moist wall a bit and hold on as best you can - with your foothold gone, the best you can do is dangle helplessly.

A deep croaking echoes from the courtyard behind you. Glancing back, you see the giant frog eyeing you intently, its huge mouth already slightly agape. You have to get over the wall now! At last your foot finds a ledge to push up from, and you start pulling your chest over to the other side; but moments later a sticky mass slams into the back of your leg.