Yup.
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Check out the link below for a guide of how to install mods in Minecraft.
If you are looking for a easy way to install mods, someone made another Minecraft that can be used for downloading mods easier.
Not in the current Vanilla (Minecraft without Mods) Minecraft, no. But their are a few Mods out there that will make that possible.
Not without mods.
As for now, chocolate is not in Minecraft. But you can install mods to add chocolate.