|Thrud and Alviss
We can infer that Thrud is the daughter of Thor being discussed in the Alvissmal, since there really isn't any other, but she's never actually named in that poem. So, she was at one point promised to the dwarf Alviss in marriage, while Thor was away on some travel or other -- but the Alvissmal is a later contribution to the lore of the Norse gods, and it's impossible to say if the story itself comes from something earlier or was just made up by the poet for the fun of it since neither Alviss, nor the events of the poem itself, are attested to anywhere else. In any event, Thor refused to honor the betrothal made without his permission, and tricked Alviss into what might be the earliest villain-monologue (and probably Tolkien's influence for Bilbo's encounter with the Trolls), which resulted in Alviss turning to stone because he was too busy showing off his knowledge to notice the sun was coming up.
|why is Alviss such an egghead? Thor and Thrud and Alviss.
So what do we know about Thrud?
Outside of her family bonds, nothing. Everything about her tells us more about the other people involved than her own character. What's that? I think it's the sound of opportunity knocking...