There are two Fraggles named Dimpley on Fraggle Rock.
One, a female with pigtails, raced against Gobo and Wembley in "Wembley and the Great Race". The other, a male, was on Rumple's Rock Hockey team in "Playing Till It Hurts". Both were also seen in the background of other episodes.
"Wembley and the Great Race"
"Playing Till it Hurts"