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You will need to get rid of the snakes around the pond to accomplish this. This article will help with encouraging them to go else place:
https://extension.missouri.edu/p/G9450

There are many reasons this could be happening.

Firstly, frogs are very, very sensitive to chemicals. If you are using any kind of chemical pesticide or herbicide, you could be inadvertently killing them.

Second, frogs are a favorite snack of many animals, like raccoons and opossums. These night time raiders may be making a snack of your tadpoles.

You may also not be providing the right environment for them to be happy in your yard. This article will help with that:
https://www.gardeningknowhow.com/garden-how-to/beneficial/attracting-frogs-to-garden.htm

They need to come out of the pond and stored indoors over winter, placing them in water. You can use an aquarium with a grow or fluorescent light over it, a plastic tub under lights or a glass or plastic jar placed on a window sill. Any container where the plants are in water and get 8-12 hours of light will work. It is best to store your plants bare rooted in the water and not in growing pots. Replace the water weekly and keep the water temperature around 70 F.

In the spring, when the plants begin to sprout, replant the them in a growing pot and place out into your pond after the last frost date has passed.

I live right on the dividing line of zones 6 & 7 in East Tennessee, and we don't do much to winterize our water feature. We remove the floating plants, keep leaves out, quit feeding the fish at first cool weather and make sure the water level is almost full. We leave the pumps running 24/7. Our pond is appx 1500 gallons and is over 20 years old. We've been doing it this way from the beginning and works for us.