Do all guys in Texas have X-ray vision?

[Double Naught Spy]

Of course you can. With that said, camo works against NV. A snake can be very hard to see because of its patterning and the background behind/around it, even out in the open. If camo works well for the animal in daylight, it works even better at night with NV. Thermal is another matter. IF (BIG IF) the snake is sufficiently contrasted by temperature from its surroundings, there is an excellent chance you can see it on thermal, regardless of the camo pattern and how well it matches its surroundings. It doesn't take a huge temperature difference to see the snake, but if the snake has been in the same spot for hours, chances are it is about the same temp as its surroundings. A moving snake or snake recently moved to a spot tends to carry its own level of heat over terrain and vegetation that will vary in temperature and hence the snake will appear to stand out.

A snake well blended and the same temp as its surroundings will be nearly impossible to see at night with naked eyes, NV, or thermal, FYI.