alt Hacker NewsFrore makes thin flat electrostatic coolers that would be perfect for laptop SSDs, but I don't know if they're available for purchase by consumers.
The main problem would be powering them. They could potentially draw power from the M.2 connector through an adapter, or soldering to an USB connector, I guess.
There's a few OEM units using their tech, but largely not still available in the market. Im honestly surprised they haven't been able to convince a high end OEM tp get them in to their laptop line.