I do a lot of winter hunting for snowshoe hare, often on frozen ground.
Maybe it's the fact that hares like cover and I seldom take shots on bare ground, but I don't recall any ricochets from the ground, even though I'm shooting at a shallow angle.
I DO get ricochets, lots of them, if I clip intervening branches- especially horizontal ones. Man, do they make a sound on their way out. It's bad enough that when hunting with a pardner, we usually head out in opposite directions if using rifles. I simply can't justify the risk of using a rifle when hunting with dogs.
When terrain, or number of hunting pardners or use of dogs are factors, I switch to a shotgun with shot.
Here's the interesting thing- The same rules apply when using centerfire calibers. Those pointy bullets, whether 22, 25-20 or 32-20 all take off cross country when encountering limbs, but not so with ground contact.