Bulda

Bulda is a female troll featured in Frozen. She is the adoptive mother of Kristoff and Sven. She is voiced by Maia Wilson.

Role in Frozen
Hulda is shown towards the beginning of Frozen, when the king and queen of Arendelle are rushing to save Anna, after she is struck by Elsa's powers. A young Kristoff and Sven arrive at the scene, where they are encountered by Hulda. Hulda proclaims, "cuties--I'm going to keep you." This could be interpreted as her "adopting" the two.

Hulda appears later in the film, during the Fixer Upper song sequence. Hulda, along with the other female trolls, assist in dressing Anna in her troll wedding outfit. Hulda aids in orchestrating the spontaneous wedding of Kristoff and Anna, taking on the role of a meddlesome mother. (Kristoff being her son).