is there a way to move downloaded ringtones to the phone ringtone folder

install one of many file manager apps from the market to do it.  one popular is Astro.

try to long press the ringtone you want to move, then move, then media, then audio, then ringtone, and it should move to where you want it.  Another option is an app called Ringdroid, it allows you to make your own ringtones from any of the music you have on your phone, I think its pretty good and fairly easy to do.  I hope this info helped you

don't know if this is another answer to your question, but i figured out after transferring some of my custom ringtones from the blackberry, they were located in the music app (pic of a subwoofer).  i went into that, selected the unknown artist, selected bluetooth, and my ringtones were there.  click on one and then bring up the bottom left file thing (sorry, don't know the terminology yet) and the middle bottom option is to use as ringtone. 

once i hit that, it became an option in the ringtones for incoming calls