how to grow tadpole in a white frong in nether in 26.1.2

To grow a tadpole into a white frog in the Nether, first make the tadpole almost fully grown in the Overworld, then move it to the Nether and finish the last bit of growth there. The key detail is that the Nether is too hostile for a tadpole to grow from scratch, so you need to shorten the remaining growth time first.

What to do

1. Grow the tadpole normally first.
2. Feed it slimeballs to speed up the aging process.
3. Once it is close to adulthood, bucket it.
4. Place it in the Nether.
5. Feed the remaining slimeballs very quickly so it matures before dying.

Why this works

A tadpole normally takes about 20 minutes to become a frog, but slimeballs reduce the remaining growth time. If you get it down to only a few seconds left, you can release it in the Nether and finish the growth fast enough.

For a white frog

The frog color depends on the biome where the tadpole grows up, not on the parents. A white frog means the tadpole must mature in a warm biome such as a desert or jungle; the Nether counts as hot, which is why this method is used.

Helpful warning

Don’t try to grow it fully from a fresh tadpole in the Nether, because it will die before it finishes. A practical trick is to pre-feed it in the Overworld until it is nearly done, then move it in a bucket and finish the last seconds quickly.

TL;DR: pre-grow the tadpole with slimeballs, bucket it, drop it into the Nether, and spam the last few slimeballs fast so it becomes a white frog before it dies.