At Macquarie University in the early ’90s, three Australian early childhood education majors, Murray Cook, Greg Page, and Anthony Field, decided they had an urge to dress up in brightly colored red, yellow, and blue (respectively) costumes that look like the uniforms on the original “Star Trek” series. It wasn’t long before they convinced Anthony Field’s bandmate in The Cockroaches, Jeff Fatt, to don a purple shirt and start entertaining at birthday parties while they danced and sang about fruit salad and wallabies. If you’re a parent of a small child, you probably know this Aussie quartet as The Wiggles,…