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

well, that's an old crooner from the 50s iirc, my mother had that one on a vinyl record somewhere that she played from time to time