Wow, all of these different versions, and yet, the one I learned as a kid is still slightly different. Very cool. I really like the "frog missed the banky" version.

Here's mine... it starts out the same, but the vowel sounds at the end are different. I learned mine in Utah somewhere between 1986 and 1988.

Down by the banks of the hanky panky
Where the bullfrogs jump from bank to banky
With an EE EE I, I, OH, OH, OOH, OOH,
Ump slop-a-dilly and a BAROOM!