The word "thankful" occurs 3 times in 3 verses in the KJV.

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Psa 100:4 Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name.

Rom 1:21 Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.

Col 3:15 And let the peace of God rule in your hearts, to the which also ye are called in one body; and be ye thankful.

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The word "thanking" occurs 1 time in 1 verses in the KJV.

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2Ch 5:13 It came even to pass, as the trumpeters and singers were as one, to make one sound to be heard in praising and thanking the LORD; and when they lifted up their voice with the trumpets and cymbals and instruments of musick, and praised the LORD, saying, For he is good; for his mercy endureth for ever: that then the house was filled with a cloud, even the house of the LORD;

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The word "thanked" occurs 3 times in 3 verses in the KJV.

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2Sa 14:22 And Joab fell to the ground on his face, and bowed himself, and thanked the king: and Joab said, To day thy servant knoweth that I have found grace in thy sight, my lord, O king, in that the king hath fulfilled the request of his servant.

Act 28:15 And from thence, when the brethren heard of us, they came to meet us as far as Appii forum, and The three taverns: whom when Paul saw, he thanked God, and took courage.

Rom 6:17 But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.