These are The Hits Sing-a-ma-jigs. There are 3 real ones, but there are some fanmade ones too. See All of them!! for all of the fanmade ones. All 3 have the voice wiggle effect, and all 3 have been sold only in Tesco stores in the UK. The yellow one is the only one with 3 ears. The red one is the only one that has hair. The tutti frutti sing a ma jig has a similar voice as the blue sing a ma jig but higher.