Froggy 101 is the #1 rated country-western station in Scranton, Pennsylvania. It originates in Frankfort, KY. It is an actual country-western station.
Dwight Schrute has a sticker advertising this station on his desk.
In season 2, ep 2: (sexual harassment) a sticker is seen next to Dwight's desk about 15 mins into the episode just as Michael makes an announcement
In season 2, ep 9: Michael's Birthday, a sticker is seen on the filling cabinet next to Dwight's desk when Jim and Pam return from the store.
In Season 7, Ep 21:the Froggy 101 sticker is seen on the wall betweenKelly 'Erin' Hannon and accounting.
In Season 8, Ep 2: The Incentive, in the Tattoo Parlor, there is another sticker.
In Season 8, Ep 3: Lotto, there is a sticker visible on the mast of the forklift in the warehouse.
In Season 8, Ep 7: Pam's Replacement, there is a sticker on Creed's desk while Dwight and Pam conspire.