Here are a couple of versions where just the pronunciation and spelling of the word "muskidan" is different...

The Real Mother Goose (1916), illustrated by Blanche Fisher Wright, has a slightly different version:

Hickery, dickery, 6 and 7,
Alabone, Crackabone, 10 and 11,
Spin, spun, muskidun,
Twiddle 'em, twaddle 'em, 21.

Here's another slightly different version from The Little Mother Goose (1912), illustrated by Jessie Willcox Smith:

Hickery, dickery, 6 and 7,
Alabone, crackabone, 10 and 11;
Spin, spun, muskidem,
Twiddle 'em, twaddle 'em, 21.

Thanks and Acknowledgements

This rhyme can be found in Children's Literature, A Textbook of Sources for Teachers and Teacher-Training Classes (1920) by Charles Madison Curry and Erle Elsworth Clippinger.