 The cane toad was first introduced deliberately into the Philippines in 1930 as a biological control agent of pests in sugarcane plantations . This was done after the success of the experimental introductions into Puerto Rico . It subsequently became the most ubiquitous amphibian in the islands . It still retains the common name of <unk> or <unk> in the Visayan languages , a corruption of ' American frog ' , referring to its origins . It is also commonly known as " bullfrog " in Philippine English . 
