That'd be some form of "plausible deniability" (although the term has a lot of different meanings depending on the context).
I know it exists for certain cryptocurrencies hardware wallets: they can be setup (but are not required to) so that one PIN unlocks the real wallet and another PIN unlocks a decoy wallet, which only has some coins.
P.S: people are probably going to point out the $5 wrench attack though
Isn't that the benefit of such a scheme? You ask for my password, I say no, you hit me with a $5 wrench, I say no. You keep hitting me, I input the decoy password and you think that is all the crypto (or content or whatever) I have.
$5 wrench attack works on known unknowns, but not well on unknown unknowns.
If they threaten to beat you with a $5 wrench and you refuse and refuse and refuse and eventually cave and unlock the wallet with $10 of Bitcoin they're going to hit you with a wrench because you wouldn't resist so hard over so little and you're obviously trying to be clever.
As long as a bad actor is aware of the possibility of decoy passwords, they have no incentive to stop hitting you with that $5 wrench no matter what you say.
I know it exists for certain cryptocurrencies hardware wallets: they can be setup (but are not required to) so that one PIN unlocks the real wallet and another PIN unlocks a decoy wallet, which only has some coins.
P.S: people are probably going to point out the $5 wrench attack though