Ruth Manning-Sanders included it in The Red King and the Witch: Gypsy Folk and Fairy Tales.
It happened as the calf said, and the boy set out to find the dragon and kill it. He found a princess who had been staked out for the dragon. He killed it, though it bit off his forefinger. He said he must leave her, but first he cut out the dragon's tongue and the princess gave him a diamond ring. The princess told her father, who asked for him to come, and many gentlemen cut off their forefingers and brought diamond rings and the tongues of all kinds of beasts, but none were the dragon's tongue or the princess's ring.
The boy came, but the king turned him away as a beggar, though the princess knew he was like the boy. Somewhat later, he came back, better dressed, and the princess insisted on speaking with him. He produced the ring and the tongue and married the princess. and they lived happily ever after : )