
Bullfrog
North American Frog
Bullfrog specifically refers to a large frog native to North America, not just any frog. 
Habitat Usage
When talking about bullfrogs, 'habitat' refers to their natural living environment, often near water. 
Amphibian Life Cycle
'Bullfrog tadpoles' indicates the larval stage in the bullfrog's life, before they become adult frogs. 