User blog comment:Omega natsu2/Episode 181: Fairy Tail vs. Executioners, Review./@comment-83.255.202.133-20140511152223/@comment-7418318-20140511152750

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As for the freezing, that's most likely done by Uosuke. Since can has Lava, Gravity and Water Terrain Effect, it's not too unlikely that he'd also have Ice Terrain Effect in his arsenal.

But as you pointed out, this will be a new addition made by the anime team, just like they created new spells for Rufus or like the old team gave Evil Spark to Mirajane in her fight against Freed, which wasn't in the Manga either.