Whilst I do fully agree with Mike that you really ought to use dependencies compiled for your particular Puppy, I've had a rummage around in my big "box of toys" (I have a directory, full to the brim with all kinds of assorted dependencies.....a legacy of many Puppy 'lib-chases' over the years!), and have come across these two:-
A 32-bit libpng12.so.0.27.0, together with "so.0" sym-link
A 64-bit libpng12.so.0.37.0, together with "so.0" sym-link
There's one of each, since we don't know what Pup you're running. Both are slightly newer than that which you say you want, so by the law of averages, backward-compatibility should work in your favour. I've attached them to this post; unzip it, and each is in its own folder.
Can't hurt to try.... (*shrug*)
[For future reference, this:-
http://old-releases.ubuntu.com/ubuntu/pool/
.... is a good place to hunt for older, 'age-related' libs. Canonical's listings for many of these date back to the days of 'Gutsy Gibbon', or earlier - 12 years or more. Mikeslr will also tell you that pkgs.org is another good 'hunting-ground'.....with which I, too, concur:-
https://pkgs.org/ ]
Mike.
