Lord Melody (born Fitzroy Alexander, 1926, Trinidad & Tobago) began singing calypso in the mid 1940s. He most likely recorded "Creature Of The Black Lagoon" around 1954-55, probably not shortly after the Universal horror classic "Creature From The Black Lagoon" was released. Calypsonians had a way of staying timely with their subject matter and this helps to date this one, even though Melody uses the monster metaphor to ridicule his own looks!
Interestingly, Lord Melody embraced Rastafari in the late 70s and released the single, "Rastaman Be Careful" soon after. Unfortunately, Lord Melody died in September of 1988 from cancer.