Michael Rosen and Dr Laura Wright explore the words that children invent and reimagine, from snotrils and jumpolines, to Farmer Christmas and the hippyhoppymus. What do these linguistic leaps of imagination tell us about how children learn language? With writer Nicola Skinner and linguist Dr Kriszta Szendroi, who explains what's going on in the brain when children reach for the right word.

Producer: Mair Bosworth

The research study on 'logs-key' referred to in this program is the work of Jesse Snedeker (Harvard University) and Yi Ting Huang (University of North Carolina).