Father Christmas Heard A Parp
Father Christmas heard a parp! E-I-E-I-O! He thought the offending fart noise might have come from a bird, but no... Maybe it was a toy or an elf? But it's not until someone very small (who MIGHT have had a few too many sprouts to eat) is discovered under the Christmas tree that the riddle is solved.
Olaf Falafel's second book about 'parping' definitely appeals to children at that recognisable 'fart' stage and there will be plenty of children for whom raspberries blown on the back of hands will be a key part of silly holiday fun.