Palmtree Forest

The 2018 biome vote confirmed that palmtrees will get added to the Minecraft deserts at some point.

When that happens, there is opportunity for new biomes to be added, this one being one of them:

PALMTREE FOREST

Lush biome inspired by the Brazilian Mata dos Cocais landscape. Tree density is like that of common forests, but they are all palmtrees. It includes a new type of village (the villagers would be using and selling whatever products Mojang implements to palmtrees, as the species found in Mata dos Cocais are commercially important to people who live there). Aquifers are a bit more common here. Palmtree forests would generate near forests, jungles and beaches.