It’s free and takes less than an hour to complete – you might as well try it completely sight-unseen. It is a cult classic for a reason, after all.
When I was only about two or three years old I loved playing the, now sadly obscure, 1994 educational PC game Dino Numbers for Windows 3.1. I feel like it really taught me a lot about numeracy and logical thinking from a young age, and helped me get a good start at school.
Give Frog Fractions to your kid and tell me if anything comparable happens.