But that might not be understood when the context involves no passwords. Purposely-slowed hash is more descriptive, but awkward, and I have seldom seen it.
Are there established alternatives? If not, what do you propose?
Addition: I wish the term would be usable for strengthening the $b$-bit hash of a $3b$-bit Schnorr signature against brute force preimage attack. In this usage, there's nothing secret involved.
¹ As rightly pointed in comment, bcrypt can only produce 192 bits of output, which makes is passable for password hashing or short keys, but not a general Key Derivation Function.