REPTILES AND AMPHIBIANS

Anacondas are found mainly in South America. They prey on a number of animals, including small deer, which they kill by coiling round and squeezing, strangling them.
At the largest, anacondas are usually around 15 feet in length, although the explorer Colonel Percy Fawcett claimed to have found one of around 62 feet in length during the early 20th century. He also claimed to have encountered a tribe of sasquatch-like creatures.

Cobras are venomous snakes found in Asia and Africa. They are notable for the flaps of skin on the backs of their heads, which can spread out to become hoods.

Crocodiles live in tropical and subtropical areas (mainly around central and south America and the Pacific). They're noted for their powerful jaws and great size - some species can reach over 20 feet in length. They feed mainly on fish and small mammals.

White crocodiles are extremely rare - I'm unable to find any information confirming whether they're a subspecies, or simply albinos. Either way, FF's "whitediles" appear to have a base in reality.

The first three are simple variations on toads - "gigantoad" is a contraction of "gigantic toad" and the poison toad is, well, a poisonous toad (=P). I don't believe that any real toads can inflict harmful poison, although they were once believed to, and the Colorado river toad secretes a hallucinagenic venom. There are also poisonous frogs. "Toady" is an obsolete word for a young toad, and also antoher word for sycophant.

The first two monsters may have been inspired by Dungeons and Dragons' giant toad and its subspecies, the poisonous toad.

The meaning of the organ toad's name? Clueless :/

Ern, well, it's a turtle from hell. There doesn't seem to be any mythological origin for this monster, and the only possible real-life inspiration that I know of is the unfortunately named Caribbian island of Hell, which does indeed have turtles. This is most likely coincidental, though.

As the name suggests, land turtles turtles that live on land, such as the box turtle and Texas tortoise. Judging by this monster's size, it was based on the Galapagos giant tortoise, the world's largest species of tortoise. Giant tortoises can reach lengths of over 6 feet, and although being an endangered species today, were once so numerous that the Galapagos islands were named after them ("galapagos" is Spanish for "turtle").

FF3's land turtle, however, appears to have flippers instead of feet, making it a sea turtle. The magma tortoise would seem to be an original creation.

Lizard rather broad term covering any reptiles of the suborders lacertilia or sauria. FF1's lizard doesn't appear to be any specific species - especially when you consider that it was six legs.

The blizzard's name is simply a pun.

Sea snakes live around the Great Barrier Reef. While they resemble eels, they are actually snakes (the name is not a misnomer), while eels are fish. Unlike other snakes, sea snakes have flattened tails and nostrils that are able to close, both of which are to aid them in swimming.