The cowardly lion, in the same movie, did have a heart.
VOA: special.2010.07.18
You could say that the cowardly lion was chicken-hearted.
VOA: special.2010.07.18
Mr Gove said teachers were encouraged to teach the early Middle Ages "by studying the depiction of King John as a cowardlylion in Disney's Robin Hood".
Reilly is not that huge, and Foster not that tiny, yet somehow each highlights the other, to an absurd degree, as if the CowardlyLion had hooked up with a Munchkin.
The Scarecrow wants to understand the world around him, the CowardlyLion wants the courage to live his life, and the Tin Man wants to fill the empty can that serves as his chest.