Thomas Dambo (right) admires his newest troll, known as Mama Rosa, on May 27 a day before it's revealed to the public at Wauwatosa's Firefly Grove Park near 116th Street and Gilbert Avenue.

Mama Rosa, as she is known, resides at Wauwatosa.'s Firefly Grove Park near 116th and Gilbert.. What they're saying: "It has hair made of oak branches," said Thomas Dambo, artist from Denmark. "My ...