Beat peanut butter and butter smooth. Mix in sugar, vanilla, and salt to firm dough.
Form 30 balls on parchment-lined tray. Refrigerate 30 minutes until firm enough to lift cleanly, additional to listed active time.
Microwave chocolate and coconut oil in microwave-safe bowl at 50% power in 30-second bursts, stirring between, 2 to 3 minutes total. Cool 2 minutes until warm, not hot.
Toothpick-dip each ball mostly in chocolate, leaving small bare top circle. Drip off excess; return to tray and remove toothpick.
If desired, smooth holes with small spoon back. Refrigerate 20 minutes until chocolate set; store chilled and covered.