Katmomma ... I didn't notice any atrophy in my tongue until my speech was almost gone. The neuro who diagnosed me told me I had it, but it all looked OK to me size-wise. I thought what he was talking about were all the crevices on the surface, which I never used to have. I never had any teeth indents, but they are very, very common, and meaningless.
What made me realize there was something else different with my tongue was when a friend stuck out his tongue for some reason a few months ago, and it looked like a cow tongue to me ... this huge slab of pale meat in the mouth ... ugh! My tongue is really dainty now. I really never thought about tongue atrophy. When you can't talk and can't swallow, the size or appearance of your tongue is way down on the worry list.
Hope this helps.