Yukkles are a mutant brand of Snizzy's favorite candy in the Aliens in the Family episode, "Dissected and Neglected." The Yukkles come in five different colors: red, orange, yellow, green, and purple. However, nobody doesn't like the green ones and usually chucks them on the ground as the green Yukkle says when he beats up the school bully.
The living candy calls Snizzy, "Mommy," after she tries to tries make more of the candy instead of bring them to life and attack the school bully. They end up moving out and having their own TV series, which bears a strong resemblance to Friends.