maybe i'll try it out on my nieces and see if it's still a hit. Hopefully 4 year olds aren't jaded music critics:

I'm a nut, cluck cluck (tapping head with fist and making tongue clicking sound)

I'm a nut, cluck cluck

I'm a little acorn round

Fallen on the cold hard ground

SOmeone came and stepped on me

that is why I'm cracked you see