Flesh is the soft parts of a person or animal, particularly the muscle and fat. Flesh can also refer to the soft, edible parts of fruit. Flesh is not usually used to refer to fish.
A flipper is an arm, leg or wing of an animal that lives in the sea. Flippers have been adapted for swimming and look very much like fish fins. Flippers can be seen on animals like whales, dolphins, seals and penguins.
Freckles are brown spots that you usually get on your nose and cheeks but can appear anywhere that sunshine can reach. Freckles are most common in people with very pale skin, especially people with ginger hair.
Fur is the thick hair that covers many animals. If you are going to make a coat out of fur, it would be made from the skin of the animal as well as the fur that grows out of the skin.
Not to be confused with fir, a kind of tree.