I think you are referring to a stem.
Do you mean a Blade of grass.
The long skinny bug with antenna commonly found in gardens is called a "centipede."
The long skinny bug with wings commonly found in gardens is called a "caterpillar."
A weed.
A long thin scarf is typically called a "scarf" or a "skinny scarf".
The crocodilian with a long skinny snout is called a gharial. They are characterized by their distinctive elongated, narrow snout which is adapted for catching fish. Gharials are native to parts of India and Nepal.
The bird you are referring to is called a "Common Loon."
The bug you are referring to is called a "silverfish."
The bird with long skinny legs is typically a wading bird, such as a heron or a stork.
A Giraffe
The long skinny black bug with wings is commonly known as a "cockroach."
Grass has a long "a" sound in the word.