Sylvia

Sylvia is a Wood Frog that appears In The Den of Forever Frost.

The Den of Forvever Frost
When Jytte, Stellan and Third are traveling to find their father they find Sylvia buried under snow. She tells the cubs that she'd been expecting them and tells them a riddle on how she dies several times during the winter.

Trivia

 * Sylvia his diverged from the Wood Frog's scientific name.