I don't think it is possible.
You might be able to make something that plugs into the dock and headphone ports.
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This is my ipod touch gen 1 internal speaker mod, the video says it all.(its NOT fake)youtube.com/watch/2tWzoe8UWRo
https://www.instructables.com/id/Make-an-iPod-Speaker-from-a-Hallmark-Music-Card/ This is an easy speaker to make, and I'm sure you adapt it, try attaching the speaker to your ipod instead of a box. Although I wouldn't go cutting any holes in your ipod. =D