User blog comment:TraGiggles/Creating the Ice Age world with Starfruity!/@comment-24723763-20140404232910

For the Ice Queen Pea, maybe the freezing effect is permanent or doesn't go away with fire exposure + maybe the pea has a frost-fire splash that freezes nearby zombies too? Also the Light Bulb is an instant that melts the ice(aka the ice is a obstacle that relates to the gravestone in the first PvZ)