I'm with John that we need to know county and elevation, but my gut says this isn't a Pygmy. There are a few reasons that I'd lean toward this being either a seepage salamander (Desmognathus aneus) or some other newly-transformed dusky salamander.
First, all the Pygmy salamanders I've found in NC, TN, and VA have been at very high elevation (over 4500-5000 feet) in spruce-fir forests, not in water. They are overwhelmingly a woodland species. Secondly, although the pictures are blurry, the salamander looks like it's a dark brown or black, and I don't see a Chevron pattern down its back. Pygmy Sallies are most easily identified by that chevron pattern and are almost always tan, reddish-brown, or light brown above.
Lastly, despite the blurry pictures, we can make out its form, and it looks a little chunkier than the Pygmy Salamanders I've seen. The body form looks more to me like a newly-transformed Spotted Dusky, Shovelnose, Ocoee, or Blackbelly. This is also a reason to doubt Seepage salamander, but I offered that because Pygmy and Seepage are both very small and look somewhat alike (beside the chevrons) but Seepage are found in water, and more widespread in SE TN. Hope this helps!