If the books were downloaded to your Kobo Touch directly or added using the Kobo desktop then they are in Kobo's kePub format (these can be converted, but it's more complicated). The easiest would be to go to your library on the Kobo website and see if there are separate ePub downloads available for your books (most books at Kobo have this option). These ePub's can then be added to Calibre and converted for use with the Kindle app.
NOTE: If the books have DRM applied (downloaded using Adobe Digital Editions) then that would have to be removed before any conversion would be possible. We can't discuss details of DRM removal here, but Googling Apprentice Alf will get you started.
The easier option of course would be to install the Kobo app on your iPad and use that to read your Kobo purchases.
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