Frogfish
Frogfish live in just about every ocean on earth, in many variations, colors, shapes and sizes. They are often so camouflaged that divers overlook them as a sponge, colorful rock, or even seaweed. Frogfish are fascinating creatures for their ability to blend in, and even mimic, the ocean environment to avoid predators and to better catch their prey.
Because of their bright colors, unusual shape, and because they tend to stay still on the reef or rock, frogfish are favourites of photographers. You rarely see them swimming freely in the water column because they are very poor swimmers.
Common variations include the Hairy Frogfish; the Painted Frogfish; the Warty Frogfish, and many local varieties endemic to certain regions (Lembeh Frogfish, found only in Indonesia's Lembeh Straits, on Suluwesi). 
Encounters
It takes a good eye to spot a frogfish as they are often impossible to separate from algae and weed. However, their eyes and their open 
mouth tend to give them away. Their mouths are usually open, ready to snatch prey.
See the Frogfish in the Philippines with ZeroBar.org.
Scientific Name:
Antennarius multiocellatus
Diet:
small fishes, crustaceans, invertebrates
Facts:
the Sargassum Fish (found in the Atlantic's Sargasso Sea) is a frogfish;
can walk on bottom using fins;
can be very difficult to distinguish the many different subspecies, however, the shape of the lure, used to attract prey, helps;
prefer sheltered water, including lagoons and shallow reefs;
can catch prey in 1/100th of a second;
often confused with scorpionfishes (frogfishes do not have spines)
Conservation and Research Agencies:
Great Barrier Reef World Heritage Area http://www.gbrmpa.gov.au/corp_site/info_services/publications/misc_pub/fauna_flora/table_06.html
frogfish photos by Kelly O'Connell