I've not forgotten
The hours I've spent in the sun
You're not in clover
The work is nobody's fun.
According to a comment on Pinterest, the song was included in an old John Thompson piano book. Thompson was a composer and music educator active in the early part of the last century, who published several books of music for beginning pianists.
It seems most likely he either composed the song himself, or it was an uncopyrighted folk song (or he based it on one). If you want an exact answer, your best bet would be to try to find a copy of his books to see if you can locate the song in one of them.