Heat gas or charcoal grill. Separate dough into 8 biscuits. Press each to form 5-inch round. Spray 1 side of each round with cooking spray. Place sprayed biscuit rounds, chicken, cheese and corn on tray for carrying to grill.
When ready to grill, place biscuit rounds, sprayed side down, on gas grill over medium-low heat or on charcoal grill 4 to 6 inches from medium coals. Cook 3 to 4 minutes or until bottoms are browned. Turn biscuits; top with chicken, cheese and corn. Cook 2 to 3 minutes longer or until bottoms are browned. (By the time all are topped, first ones are done.)
To serve, top tostadas with lettuce, jalapeños, salsa, guacamole and cilantro. Serve with lime wedges.