The version I was taught in the late 40's/early 50's in Brighton was

Oh Jemima Look at your Uncle Jim,
He's in the duck pond learning how to swim,
First he does the breaststroke, then he does the side,
Now he's under the water, swimming against the tide

but because I was young, I didn't hear Jemima correctly, and thought it was "Jim Ido". Besides a Jemima was a guzunda (goes-under, a po.

Grandfather was an engine driver and Dad was an engineer and in the RNVR so either might have picked it up away from the South Coast