Trolltunga is one of the most spectacular mountain formations in Norway. It is located 1100 MASL, 700 meters above Ringedalsvatnet. From Trolltunga you will have a stunning view over the Folgefonna Glacier and National Park.
It's a 55 minutes drive to Skjeggedal from Rosendal, the starting point for the hike.
There are a lot of choices for beautiful hiking in Rosendal / Kvinnherad: http://tursti.kvinnherad.no/
The most popular hikes are: Melderskin (1426 MASL) and Malmangernuten (890 MASL).