Have Three animal(a pig an elephant and a frog) challenged one another to reach the Johor shores from mainland Singapore. who did not succeed would be turned into rock. The first A frog failed to cross was turned into Pulau Sekudu. Pulau Sekudu literally means Frog Island in Malay. The Elaphant and the pig They did not make it too thus both of them fused together to become the main island of Pulau Ubin.