No, there is no desktop. Each app has its own private document storage directory.
If you install iOS Frotz, you can set it up to accept Zcode or Glulx game files. However, the procedure is kind of a pain in the ass. See the "File Transfer" section in the Frotz info/settings page.
In iOS Frotz, if you switch to the Notes page and tap the page icon near the top of the screen, you'll see a list of all the transcripts you have saved. You can read a transcript and copy its text to the clipboard.
thanks for the feedback