Ze leetal Froggie

I'm a fan of A cappella music... My only source of any such music is Youtube, but the videos posted there, although very good are usually the work of other amateur A cappella enthusiasts... One day, or rather, one night as i was rummaging through Youtube going through some more amateur videos, i came across the video above...
The song stuck... and it stayed stuck...
for several days...
and nights...
and through night mess ...

why the frog?
i don't know...