I used silentwhisperer’s design, it’s like a 10 block drop from the magma sproingy dudes spawner, then they bounce over to a 3x3 (x4?) hole. There are carpets over the hoppers and snow above that (this keeps the magmas from settling in a hopper)

The frogs don’t stay in the snow for more than a second, not enough time to freeze.

I only lost one of the 6 frogs I brought over, because boats have too many HP in bedrock