Gappa, the Triphibian Monster (1967)

"Gappa, the Triphibian Monster" is a 1967 Horror movie directed by Haruyasu Noguchi and starring by Tamio Kawachi, Yōko Yamamoto. An expedition in the South Pacific lands on a tropical island where the natives worship the mysterious deity Gappa. An earthquake opens up an underground cavern and a baby reptile is discovered inside. The natives warn the foreigners to leave the hatching alone, but they don't listen and take it back to a zoo in Japan. Soon after, moma and papa Gappa start smashing Tokyo looking for their kidnapped child.