Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
3. pīpĭo, ōnis, m., a young piping or chirping bird, a squab: servos habuit vectigales qui eos (palumbes) ex ovis et pullicenis ac pipionibus alerent, from the produce of the eggs and chickens, Lampr. Alex. Sever. 41.