Man pages matching name crypt::prng::chacha20 in section 3pm:

Crypt::PRNG::ChaCha20.3pm.en	debian 10 / libcryptx-perl
Crypt::PRNG::ChaCha20.3pm.en	debian 11 / libcryptx-perl
Crypt::PRNG::ChaCha20.3pm.en	debian 12 / libcryptx-perl