Download the full version of the original "Frogger" for free from the Softonic website. Go to the website, and click on the free download button at the top of the page. Softonic also has a description of the game and reviews by users and the Softonic editorial team.
The original dates back to 1982, and the graphics and the sound are very basic. To download a more advanced version, Best Old Games has the 1997 3D "Frogger." For an even more up-to-date version, download "Frogger 2" from The Iso Zone. In "Frogger 2" you have control of both Frogger and his friend Lillie the Frog.