My neighbors "musical frog" is carved from wood, is hollow, and has a ridged back. A bat, stored in a hole drilled through the frog, is used to make sounds. The wooden bat is dragged along the ridged back to make a "ribbit" noise. A 123-D catch copy of the frog was made. A hole and resonate chamber were created in the copy with an openSCAD program. The program and the 123-D catch file are included.