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, with many background Fraggles wearing nothing at all, though they do tend to wear scarves during winter months. 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 dialog 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." Familial relationships exist among Fraggles, for example Traveling Matt is Gobo's uncle.
- Historical Fraggles