Vellus Hair
An immature frog is often called a pollywog.
Being called a "tool" is often used as an insult, suggesting that the person is being manipulated or used by others, or that they are only useful for a specific purpose. It implies that the person lacks individuality or is easily influenced.
There is no pigment made from cochineal. Real cochineal is a dye (not pigment) that is extracted form a beetle, but it is a potential allergen. Although it is often referred to as cochineal, it is also called carmine.
An immature herring canned in Norway, Sweden Iceland and Denmark is called a "slid"No, it is called sild pronounced 'sill'; it is not immature, just raw.
A baby jellyfish is a tiny, flattened creature called a Planula.An immature jellyfish is called ephyra.
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12 year old boy and immature are often synonyms. This is pretty normal.
Black ice
No. It is an joke, often used in immature ways.
When immature people do not get their way, they often pule and complain.
This is an infection by a primitive single cell body called Coccidia. Often found in the feces of dogs and particularly puppies because of their immature digestive system. May be transferred to humans.
This is most often called an "anti-hero." It's a person who you hope wins, even though in real life you would call him a bad guy. Alex from "A Clockwork Orange" is an anti-hero. John Travolta and Samuel Davis played anti-heroes in "Pulp Fiction."