PORPOISE is validvalid

to move forward with rising and falling motions [v PORPOISED, PORPOISES, PORPOISING]

77,773 of 196,601 in NWL2023·also valid in CSW24

a short-snouted genus of the dolphin family, also PORPESS, PORPESSE [n -S] / to move like a porpoise; specifically (of an aircraft, esp. a seaplane) to touch the water or ground and rise again [v PORPOISED, PORPOISING, PORPOISES]