How about musical freeze - they all dance and when the music stop the last one to bob down is out? You could also do whats the time mister wolf, or else the sleeping giant -where they sneak up to get a little prize without being spotted or caught by the giant. I would recommend anything where they all play - lining up for pin the tail type games don't work at this age because they have to wait for so long!

Songs with actions can work too, so a sing and dance along.