Meaning: This sentence describes the parrot's reputation rapidly growing and becoming widely known.
Choice of Words: "Polly" is the name of the parrot. "Fame" refers to being widely known and respected. "Spread" means to move or distribute something over a wide area. "Like wildfire" indicates something spreading very quickly. "Wildfire" is an uncontrolled fire that burns in a natural area, such as a forest or grassland.