The way my brother and I sang it as kids was:

Hitler had but one big ball,
Goering had two, but they were small,
Himmler had something similar,
But poor Goebbels had no balls at all!

And to the same tune:

Vote for Wallace in '48,
Thurmond he stands for hate,
Dewey is really screwy,
And Truman ain't human of late!