Recently the toad from this video has been identified as an American Toad inside this post in Reddit. The original video mentions it was filmed in White Clay Creek State Park, Newark, Delaware, USA.
Calculating the water's wavelength based on the sound yielded a value of 0.5mm. Using the image's ratios, the toad's length can be estimated. The result was 7mm. Yes, a toad being 7mm long.
The purpose of this question is to ask both if it effectively is a species of American Toad and if it's plausible for it to be 7mm long.
Thanks