Answer:
Petey
Step-by-step explanation:
Petey is a faddist who wanted a rancoon coat. But later finds out that Polly had already said yes to him because he had a racoon coat.
The narrator traded his racoon coat with Petey for Polly because he knew that Petey wanted a rancoon coat.
Polly used the fallacies that she had learned in order to explain why she should go steady with Petey for logical reason that is the raccoon coat.