The term 'One with Forked Tongue' is a phrase used to describe someone who is deceitful or untrustworthy. The crossword solutions for this term are 'Rattler' (7 letters) and 'LIAR' (4 letters). The word 'Rattler' is derived from the rattlesnake, which is known for its forked tongue and ability to deceive its prey. Similarly, the word 'LIAR' is used to describe someone who is not telling the truth. Therefore, both words can be used to describe someone who has a forked tongue.