There is no smart phone app for Zebra Games. Zebra Games has only a website, hosted at ZebraGames.com. Their website has many different Flash games available for playing in a computer browser.
There are many similar Android and iOS apps to the specific browser games available on Zebra Games, but no actual Zebra Games app. Since the games on the Zebra Games website are designed only to be played on a computer, it's not possible to access the games simply through a smartphone browser.
It is possible to find smartphone apps similar to the browser games found on Zebra Games by searching for them on the App Store or Google Play Store.