From publisher blurb:
The world's most famous fantasy role-playing game has many official monsters, but many creatures we loved in prior editions have been overlooked. The 5e Fiendopedia brings some of these back and updates them for the 5th edition rules.
This PDF includes 6 new, low-challenge monstrosities: Crabman; Dust Digger; Hippocampus; Kamadan; Kech; Manbat.
Each creature gets a full-color image, 5th edition statistics & abilities, and background/ecology information.