Fraggles are a noble race - fearless, dignified, and intellectual. They represent the very pinnacle of civilization and culture. A Fraggle is most assuredly the best of all possible creatures. Music is the greatest of the Fraggles’ art forms, but Fraggles also possess uncanny curiosity and great athletic ability. Fraggles naturally have physical prowess and a dance-like grace.
- Uncle Traveling Matt, "Beginnings"
Fraggles are one of the three primary species who occupy the regions in and around Fraggle Rock, along with Gorgs and Doozers. Fraggles are, on the whole, a frivolous lot, interested in fun and frolic and temporary pleasures. Physically, each Fraggle possesses a tufted tail (properly termed the "belubeous"), which flares out when its owner is frightened. They also have snouts of varying sizes and shapes rather than individual noses (in some ways resembling the early Whatnots like The Gogolala Jubilee Jugband on The Muppet Show). Fraggles come in a variety of colors, unlike the green Doozers. Clothing appears to be more or less optional for Fraggles; they wear as much or as little as they wish. Some wear none at all. In height, they are knee high to a Gorg, and the Doozers are knee high to the Fraggles. Their diet is dominated by radishes and supplemented by radish-based Doozer sticks.
The issue of Fraggle birth and reproduction is deliberately obscured. Early on, the production team had considered explaining that Fraggles are hatched, and this is reflected in Storyteller Fraggle's dialogue in "The Terrible Tunnel." Early on, baby Fraggles are also featured in several crowd scenes. At some point, however, a decision was made not to go into the issue. Thus, in "Wembley's Egg," the Fraggles are confused by the Tree Creature egg, and doubt Wembley's claim that it is "a house for babies."
Fraggles have a somewhat unique method of measuring time. They understand what a day is and they seem to understand what a year is (they celebrate birthdays), but they don't appear to have any terms for the time in between. Fraggles don't seem to know what a week or a month is; to a Fraggles, time is made up of seconds, minutes, hours, days and (assumably) years.