This is possible to a degree by using in-game commands made available by enabling cheats. However, this command won't necessarily change a biome's blocks, but an area's biome classification.

In Minecraft, you can place and remove blocks using your bare hands or a designated tool based on the block's type of block.

Minecraft's command blocks allow players to automate console commands, but they are hard to find, so this guide shows how to get them.

You can get a command block in your Minecraft Java or Bedrock world using cheats and a special chat command.

However, "Minecraft's" customizability extends to its cheats, too. Using a console command called "/gamemode," you can switch what kind of game you're playing at any time. Here's how to use the ...

You can only get light blocks via the /give command so, er, don't expect to go mining for light. (If you need more details on Minecraft console commands, you can follow that link.) ...

Minecraft: Education Edition can now teach kids how to code with the new Code Builder tool and the 'Agent', an in-game robot. Mojang will add Command Blocks in Education Edition later this year.