Tootler - My dad used to sing that song. He ended it with:

They paddled off across the lake
"Hey Ho" says Roly
And got swallowed up by a big black snake
With a roly poly gammon and spinach, "Hey Ho" says Anthony Roly.

That was the end of him and her
"Hey Ho" says Roly
Now we won't have tadpoles covered in fur
With a roly poly gammon and spinach, "Hey Ho" says Anthony Roly.