I guess you mean a table of the strings that appear on-screen, not actual screen captures (images).
As Android is open source, everything should be freely available. In principle, you should be able to create a TM with all the text strings in the OS, supposing you can find the same exact android version translated into your two languages.
I'm not sure if a ready-made bilingual string table or TM is available... You could try and dig around here for En and Fr translations of the same Android version and create one yourself: http://source.android.com/
Of course, extracting the text from the source code is not trivial by any means and may not be feasible for a lowly translator.
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