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Polarization can be oriented to block light from any specific angle; the polarization in polar Oaks is oriented to block light reflected up at you i.e. from the ground / surface below you.
A neat effect sometimes is looking (through polar lenses) at a car or something with a curved surface (like looking at my truck head-on) with the light reflecting off it at the proper angle. You see the flat surfaces (center of hood & windshield) with no glare (blocked by polar) while the curved outside edges have glare. And if you tilt your head back and forth, you see the blocked zone move back and forth.
Another trick is to hold your polar Oaks up to a LCD screen, then rotate them around. LCD displays are polarized, too, and when you rotate your Oaks to line them up so the blocking is matched to the light coming from the screen, the screen blacks out. That's also a simple test to see if your lenses are polarized.
As far as recommending lenses goes, there are two lenses specific for water. Shallow Blue is a contrast tint and Deep Blue is a neutral tint. They're both polarized. The main difference between these and other polarized lenses is the iridium tint is designed to cancel out the blue of the water, letting you see underneath the surface. I have no idea if they are available (or can be custom cut) for frogs.