If you'd like to distribute your own IF games bundled as an iOS app, I would suggest starting with
instead of Frotz. This is the app/library written by Andrew Plotkin which is designed to be shipped as a single game, rather than a general interface for downloading/playing IF.
Of course, either way, keep in mind that the only way to distribute iOS apps (to non-jailbroken phones) is via the App Store, which means you need to sign up to the developer program and pay $99/year to be able to keeps apps in the App Store. If you're not already a Mac or iOS developer, that'll require a bit of effort learning about Objective C, Xcode, and the process of building and distributing apps.
If you're not intending to sell your games but just want a convenient way for iOS users to play them, I would suggest just hosting a web page with download links for the games and a link to Frotz on the App Store. Once Frotz is installed, tapping on download links from Mobile Safari will automatically offer users to open the games in Frotz.
Regards,
Craig