This creature is most probably the creation of an environmental problem. Children at a nursery in Weston-super-Mare, England spotted the three headed frog hopping in the garden.

Source: BBC News

The blog famous cyclops kitten, Cy was first thought to be a joke photo manipulation. Living only for a day, It had only one eye and was noseless.
Source: News

The most infamous headless chicken, Mike wowed the world by living for 18 months which indefinitely entered it into the Guinness World Records. It could still live becuase most of his brain stem and ear was left on his body.
Source: Mike The Headless Chicken

Nope this is not photoshop manipulated. A female polar bear named Pelusa turned purple after she was given a special treatment to clear up a skin condition. This has attracted crowds at the Mendoza City Zoo in Argentina. The fur has returned to normal after a few days.
Source: NW Botanicals

Genetic mutation called ‘feather duster’ of a parakeet.

Dolphins has taken a pink hue in the Pear River Delta situated between Hong Kong and Macau. It is not known why they are pink in colour but several assumptions include the lack of natural predators or the pink colour is a byproduct of blushing to regulate body temperature.
Source: 2 Dolphins

The two-month old animal, named Cham Leck which means ‘strange,’ was given to monks at a local pagoda by a farmer who feared the six legged cow would bring him bad fortune.
Source: Steve Quayle

The hooded seal has a large elastic nasal cavity and when fully inflated resembles a large black ruber ball. They are large aggresive mammals that can exceed 3m in length and 400kg in weight.
Source: Canadian Museum Of Nature

The large ocean sunfish vies for the title of strangest fish in the sea. It has an almost circular, flattened body. It weighs up to 2 tons and 3m long. The head is almost a third of the whole body length.
Source: Earth Window