The Baby Bestiary by Metal Weave Games is a brilliantly inspired two-volume set (as of this writing) of cute and cuddly — and sometimes horrifically dangerous! — monsters that are perfect for rearing in the fantasy roleplaying game of your choice. I’ve created a shared Google Sheet that acts as an index for all of the monsters that appear across both volumes, lists their rearing traits for easy reference, and links to several monster stat blocks for your game of choice, whether it’s Dungeons & Dragons 5th edition, Swords & Wizardry, or Pathfinder (1e)! Click below to check out the table.
Note that some of the monsters don’t appear in online SRDs, so you’re going to have to go to the official monster book of choice and find the monster or some equivalent. If you have ideas for cool variants and other references, post ’em in the comments below!