The jungle log is a naturally generated block that is found in jungle trees, it is primarily used as a building block. You can create jungle wood planks from them. You can also strip them by right-clicking them with an ax but once stripped they cannot be reverted back to their log form.
A jungle log (via screenshot)
You can find jungle logs in the jungle biome, from jungle trees. They can be picked up by creaking them with any tool but using an ax is the quickest. If you are able to get a sapling you can grow your own jungle trees to farm it.
The jungle biome (via screenshot)
Jungle logs can be used to make jungle wood planks that can be used in all crafting recipes that require any form of wooden planks. They can also be used to make charcoal and as a building material. Jungle wood is also the only block that cocoa beans can be grown and farmed on.
Making jungle planks from a jungle log (via screenshot)
Jungle logs are a variant of logs that are specific to the Jungle biomes. You can use it for all crafting recipes that involve the usage of logs. The ability to grow cocoa beans on them is exclusive to jungle wood.
A. Jungle logs can be found exclusively in Jungle Biomes.
A. The jungle biome is rare as it doesn't cover much of the area in the Minecraft Overworld.
A. To make jungle wood, place 4 jungle logs in the 3x3 crafting grid.