Throughout the series, Wolf Talk is recently used by Torak and Wolf.
Wolf talk is basically Wolf language like a dog would speak. Talking in wolf could be a "Uff" like wolf. Normally it's just "Uff Uff Uff" in a emotional effect for other's to understand. Calling a pack or any wolf, alike Torak, needs howling. It could have a meaning in matters of Wolf Talk. It is shown to be hard for Renn, as said in "Soul Eater". Her howl was wobbly but could be heard by Wolf.