The Sky Ship Friends was a series of collectible toys that were popular among Kelemane's species for a certain time. The toys were imaginative speculation about the people who lived aboard the Sky Ship.
A technician working at an observatory on Kelemane's planet once commented that he had all of them when he was a child, even the duplicates. According to him, it was impossible to walk into his home without tripping over the toys. They were prohibited from the astronomer's home by his grandfather, however. (VOY: "Blink of an Eye")