The original tongue-twister is of unknown origin. In it,

"How much wood would a woodchuck chuck if a woodchuck could chuck wood?

is paired with

"A woodchuck would chuck all the wood he could if a woodchuck could chuck wood."

or

"As much wood as a woodchuck would, if a woodchuck could chuck wood."

Woodchuck Tongue Twister:

How much wood would a woodchuck chuck
if a woodchuck could chuck wood?

Answer given in reply;
He would chuck, he would, as much as he could,
and chuck as much wood as a woodchuck would
if a woodchuck could chuck wood.