Karen Disher is also the film director of Blue Sky Studios and has fun voicing Scratte in the third movie of the Ice Age franchise.

Even though according to Wikipedia, Scratte made a silent cameo in Ice Age: Continental Drift. But it's not true.

If you listen closely, you can hear Scratte's voice going, "Yoohoo!" to get Scrat's attention.

So Karen Disher did voice Scratte in Ice Age: Continental Drift.