Vintage Murano art glass green/clear frog.

The frog is green but can appear clear in areas; eyes and lower part of the body. He is in good condition with no cracks/chips. Minimal surface wear. Heavy piece. Sold as is and as found. There's a foggy area on back on top of glass more to the left side; see pics, cannot explain. Measures 3.75" X 6.5" X 4"