Answer: yertle

AnswerCrossword Clue
YERTLESeuss reptile
YERTLETurtle in a Dr. Seuss title
YERTLEDr. Seuss title animal
YERTLEKid-lit title character who cries, "Oh, the things I now rule!"
YERTLEDr. Seuss's title reptile
YERTLEDr. Seuss title turtle
YERTLEDr. Seuss title character with a shell
YERTLEDr. Seuss' turtle
YERTLEDr. Seuss title character
YERTLEKid-lit title character who says "I am the ruler of all that I see!"
YERTLEBlue-backed Dr. Seuss character
YERTLESeussian reptile
YERTLEKing of a Seuss pond
YERTLESeuss pond-ruling reptile
YERTLETurtle king of the pond on the far-away island of Sala-ma-Sond
YERTLEDr. Seuss shelled title character
YERTLEDr. Seuss's "king of the pond"
YERTLEDr. Seuss's turtle
YERTLEDespotic Seussian reptile
YERTLESeuss's king of the pond
YERTLESeuss turtle
YERTLESeussian "king" undone by a burp
YERTLESeuss character inspired by Hitler