If everything I've heard is not a rumor, then yes, there is going to be a Frozen 2. Some say no, though, so Idk...
link
Oh, and I know this is just a fanfiction, but it helps with all the cravings and whatnot (for me anyway). It's pretty much unofficial, yet an awesome mini sequel:
link
It's actually the first Frozen fanfic I've read so far. xD
I can't wait to read more Frozen fics!! <3