And about that "nickel to buy a pickle" line, see this rhyme from http://blog.oftheoctopuses.com/000518.php
"heres one that me and my friends do: i Went down town to meet charlie brown he gave me a nickle that bought me a pickle the pickle was sour so he bought me a flower the flower was dead so this is what he said: down dow baby down by the rollercoaster sweet sweet baby never wana let you go just because i kissed you doesnt mean i love you shimmy shimmy coco puffs shimmy shimmy pow shimmy shimmy coco puffs shimmy shimmy pow My momy your momy live across the street 18,19 Alligator street Boom Bang Choo Choo Train wind me up i do my thang ( hit the person beside you) Oops i'm Sorry!" posted by Sarah at July 17, 2005
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Sinsull also posted an children's rhyme with the line "nickel to buy a pickle" in the I'm Rubber . You're Glue: Children's Rhymes thread:
...One that went on forever and I forget the beginning:
I went to Japan To see a man He gave me a nickle to buy a pickle The pickle was sour So I bought a flower The flower was dead so I bought a bed The bed was broke so I bought a rope The rope was
It went on until "out goes Y-O-U.
-snip-
I would consider each of these to be children's trading rhymes. Although, strictly speaking, the first example is made up of four different independant rhymes or fragments of rhymes and only the first rhyme is what I call a "children's trading rhyme".
In my opinion, that first rhyme ends with the line "the flower was dead" or that entire line though the "so this is what he said" part serves as a segue to the second verse. The second rhyme ends in shimmy shimmy pow". The third rhyme fragment ends in "18,19 Alligator street", and the last rhyme ends in Oops i'm Sorry!"