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App Data Folder

I don't have a /android tree in my filesystem, but if you mean /sdcard/Android/data then no. Just look at the subdirectories and the names correspond to your installed applications. Most will be empty, but those which are there are there for a purpose (data which the app needs to store).

It's a good rule of thumb: if you don't know what something is for, don't mess with it ;)
 
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In Android 4.x /sdcard is internal storage, with the "external sd card" (i.e. the real one) having a different path).

If you meant /data (i.e. the top level internal data directory) then absolutely you should not delete stuff - the apps themselves are there. But that path doesn't include the word "Android", so the one I mentioned is the closest I could find on my phone (which doesn't have a removable sd card - everything is internal).
 
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