No. I'm playing in English right now, and I don't remember what they're called in Russian anymore. Frozen Ground: creates a 3x3 area that is invisible to the enemy. If an enemy unit enters it, it freezes (and the area becomes visible).

Added 3 minutes later
By the way, regarding water magic, Stronghold has the most advantages, as they can use both water and fire magic. And practically all water magic spells apply the "Chilled" effect. This suggests that the water+fire combination is the main attacking magic combination for Stronghold mages.