Drolleries (or drollery), often called a "grotesque", are decorative thumbnail sketches in the margins of Illuminated manuscripts, most popular from about 1250 through the 15th century, although found earlier and later. When used in conversation grotesque commonly means strange fantastic ugly or bizarre and thus is often used to describe weird shapes and distorted forms such as Halloween An illuminated manuscript is a Manuscript in which the text is supplemented by the addition of decoration such as decorated Initials borders and Specifically images which appear as mixed creatures, either between different animals or between animals and human beings, or even between animals and plants or inorganic things. For example cocks with human heads, dogs carrying human masks, archers winding out of a fish’s mouth, bird-like dragons with an elephant’s head on the back.
One manuscript The Croy Hours has so many it has become known as The Book of Drolleries.
Another manuscript which has many drolleries is the The Luttrell Psalter, which has hybrid creatures and other monsters on a great deal of the pages.