I am also looking for this song. It was played on CFGM in Toronto I belive back in the 70's. From what I remember is was sung by Billy Charm or Charn, but I have not been able to locate an artist by this name.

I believe the lyric's were

Tommy went wah cu-ko wah cu-ko wah
Down to the Field Cuk-o we cu-ko we
To watch his weed grow Cu ko whoa cu-ko whoa
When a snake bit his heel cu-ko whoa

Everybody seems to have a slightly different version, but this is how I remembered it. Would love to get an mp3 of this.