Games by Crotch, like Country Life Survive: life simulators with survival mechanics and lots of scat scenes
'School Girl Courage Test' series (Here's fifth): scare girls during a test of courage which can lead to them wetting and shitting themselves
There's probably a bunch with diapers, but I'm not into diapers so don't know them.
Games not translated;
Games by
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always have some scat. Some of the games are just peeping on girls using toilets
Games by
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tend to be exhibitionism & humiliation including some scat
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seems to be focused on it (note haven't played it)
Eromanga;
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(start with Benkei series, since it's kind of a prequel)
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has done several scat focused works
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's works include lots of enemas and scat
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's works including this
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(pages 49-56)
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does scat & futa
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If you wanted anime, I'm not sure about anything focused on scat. But what does come to mind are; Night Shift Nurses, Euphoria, Bondage Game, Starless (they each have some scat scenes in some episodes)