Back in 1994, Michael Wood and Robert Lally made the company called LeapFrog. They gave us the frogs named Leap, Lily, and Tad with cool voices. The first LeapPad book was Lil's Loose Tooth, which the Frog Kids appeared in.
They even made Casey Cat, Danny Dog, Tim Turtle, Parker Pig (the bossy one) Dot Dog, (Danny's sister) Professor Quigley, and Mr. Websley. And, of course, they made Mr. Frog, Mrs. Frog (they are the Frog Kids' parents), and Grandpa Frog. Unfortunately, he was not in any of the LeapFrog films, but he WAS in some of the LeapPad Phonics books.