Identificaciones de saraschneider

Photos are of two different frogs of the same species taken about 1.5 meters from each other. They are both about 3 - 4 cm long and grey/olive green with darker black/brown markings. From observation, they seem to be able to make themselves a more vibrant green at night, when they are more active. I frequently find them hunkered down in places like this, where they will spend much of the day until nightfall. Interesting that this species is also a brighter green on the west side of the Cascades than the east -- perhaps suggesting regional variants?