Use the arrow keys to move. Level 1: In Level 1, try to get the frog across the road. If you get hit by a car, you lose a life. If you touch a fly, you earn an extra life. Once you've reached the other side, go to the portal which will lead you to Level 2. Level 2: In Level 2, try to get the frog across the road by hopping on the logs. If you go into the water, you lose a life. You also can eat flies to get extra lives. Go to the portal to win.
Some of the codes I used are from Scratch 3 - Frogger Game Beginner's Tutorial by Learn Learn Scratch Tutorials. Comments welcome.