The Typekit font licensing does not allow the fonts to be embedded in any desktop or mobile application, including those build with Phonegap. You will need to purchase a separate license from the foundry that owns the font(s) you'd like to use for this project.
You can read more on the Typekit font licensing here:
I hope that this helps; let me know if you have any other questions.
[moving thread to Typekit forum]