with jack frosts new stronger power, could he have e power to potentially start a new ice age, or something similar to that?
He does, but he won’t (I’ll clear that now, since that’s not where the plot is going). Pitch’s offhand comment about ‘Snowball Earth’ was actually a reflection of just how ridiculous Jack’s powers are at the moment.
Oh, Jack, if only you could a) control them, b) didn’t lose your mind whenever you started using them and c) could make those snowballs again.
Gwyn, of all people, will eventually start helping Jack with this side of things. Well, ‘helping.’ You know Gwyn, he’s not always very good at that.