What is "bullywug"

In the Dungeons & Dragons fantasy roleplaying game, the bullywug is a type of fictional monster. The bullywugs are portrayed as a violent race of marsh-dwelling frog-like humanoids. The bullywug was introduced in the first edition Advanced Dungeons & Dragons game's original Fiend Folio sourcebook, created by Gary Gygax and his son Luke. The bullywugs subsequently appeared as antagonists in two first edition adventure modules, Dwellers of the Forbidden City (1981) and Needle (1987), and then continued to appear in the game's second edition, third edition, fourth edition, and fifth edition.