On March 12, customers can get a free small Thin Mints Frosty with any purchase in the mobile app at participating Wendy’s restaurants nationwide, according to the Ohio-based burger chain. The one-day offer can also be redeemed online, Wendy’s said.

In honor of National Girl Scout Day on March 12 and St. Patrick's Day on March 17, Wendy's is offering free Thin Mints Frostys and Fries this week, respectively. Customers can grab the deals through the Wendy's app or website.