Avoid fish
When a fish is chasing you in a pond, stream, etc.,
try not to look back. Keep looking forward and you will lose him
after awhile.
Defeating creatures on the ground
An easy way to beat any creature on the ground is to
get on top of a box, barrel, or stairs then shoot them until they
are gone.
Slick Willy's River Boat level
In Slick Willy's River Boat (level 3), you have to
ring a bell. Go to the front of the boat where about two or three
steps are located. Go up to the steps, then go back slightly.
Press [R3] and Frogger will look up. Shoot the bell three
times pressing [Square]. All doors will become unlocked.
Go to the very top of the boat and go over to Slick Willy (the
alligator). Fight him and win. Defeating him is not difficult
-- just go over and keep hitting or kicking him. You can now take
his speed boat and go to the next level.
Slick Willy's River Boat level: Cats
in water
Fool the cats by falling in the water by going on the
ladder. Fall off when the cats are chasing you. They will fall
in the water and not die.