Jerbs:

Largemouth have a preferred temp range, once exceeded they seek cooler water temps. If youve got a cool creek coming in with trout in it, and it provides some shade, and maybe has access to deeper water (relative term), then no reason why some toady toads wouldnt be up there. Especially at night. Or, maybe they are sitting in the deeper water where the creek empties into the main body just waiting for one of those trout to come swimming out ;)