If you're asking me: no. "Restoration," "Holy," and "Protection" are all reused in a few different talent trees, and for both of those, while the talents are different, the intent is the same. "Frost," for both Mages and Death Knights, will have the same aim as well, as far as we've been told so far -- both classes will aim for DPS in those trees, with extra consideration given to crowd control and slow debuffs. In fact, depending on exactly how the Death Knight's talents work, the "Frost" title might help newer players understand the tree a little better anyway, especially if they've played with a Frost Mage before.
Not that people don't have ideas -- "Ice" (yes, Ice, baby), "Chill" and "Really, really cold stuff" are all names being thrown around on the forums. But Blizzard will probably stick with "Frost" -- no reason to change it up, especially if the abilities line up with the Mage tree as much as we expect them to.