There should be some unnamed minor humps in the area, but really at Lake Ann, you are pushed so far up against Mt. Shuksan, that a climb of Shuksan by way of the Fisher Chimneys is the closest thing, and there really aren't any great destination scrambles from Lake Ann. Furthermore, in good weather, Lake Ann is really, really crowded as a popular hiking destination.
There are places other than Lake Ann in the area which would afford much better scrambling opportunities. Just some of the campgrounds down on Highway 542 would permit scrambles of Church Mtn., Excelsior, Tomyhoi, Yellow Aster Butte, and Goat Mountain. Less scenic than camping at Lake Ann, but better objectives.