I found an iPhone app that you can configure to show a random note on the musical staff and when you flip it it shows the note name and the position on the fretboard. It's called Ukulele Notes Flash Cards. You can see it in the App Store https://itunes.apple.com/us/app/ukulele-flash-cards/id592180241?ls=1&mt=8”. You can select which notes to include and it supports low and high G tuning.
I'm not the developer, just a user who's finding this useful.
I'm not the developer, just a user who's finding this useful.