The words are different from the original (Child) version but this is a very close approximation of the as performed by Sandy Denny.
"I forbid you maidens all that wear gold in hair To travel to Carterhaugh, for young Tam Lin is
None that go by Carterhaugh but they him a pledge Either their mantles of or else their maidenhead"
Janet tied her green a bit above her knee And she's gone to as fast as go can she
She'd not a double rose, a rose but only two When up then came young Tam Lin, says, "Lady, no more"
"And why come you to Carterhaugh without command me? " "I'll come and go", young Janet said, "and ask no of thee"
Janet her kirtle green a bit above her knee And gone to her father as fast as go can she
Well, up then spoke her father dear and he meek and mild "Oh, and alas, Janet," he said, "I you go with child"
"Well, if be so," Janet said, "myself shall bear the blame There's not a knight in all hall shall get the baby's name
For if my love were an earthly knight, as he is an elfin I'd not change my own true for any knight you have"
So Janet tied her kirtle a bit above her knee And gone to Carterhaugh as fast as go can she
"h, to me, Tam Lin," he said, "hy came you here to dwell? " "The of fairies caught me when from my horse I fell
And at the end of seven years she a tithe to hell I so fair and of flesh and feared it be myself
But tonight is Halloween and the fairy ride Those that would let true love win at Mile's Cross they bide
So first let pass the horses and then let pass the brown Quickly run to the white and pull the rider down
For ride on the white steed, the nearest to the town For I was an earthly knight, give me that renown
Oh, they will me in your arms to a newt or a snake But hold me tight and fear not, I am baby's father
And they turn me in your arms into a lion bold But hold me tight and fear not and you will love child
And they will turn me in arms into a naked knight But cloak me in your mantle and me out of sight"
In the of the night she heard the bridle ring She heeded what he did say and Tam Lin did win
Then up spoke the queen, an angry queen was she, "Woe betide her ill-far'd face, an ill may she die"
"Oh, had I known, Tam Lin,'' she said, "what this I did see I'd have him in the eyes and turned him to a tree"