I need to know what it is called when a phrase, or a sentence uses the same sounds for each word, for example, "stocking stuffer", "A kitty cat can't climb quickly"
The word you are trying to think of is alliteration. That is the word for several words close to each other starting with the same sound (particularly if it is a consonant sound). It is something that is often used in poetry.
- Come quickly, clumsy Clyde.
Freckle-faced Frieda fell forward.
The silver snake slithered slowly.