These creatures look like halflings who have been severed vertically, so that only one half of their body is left. They are also known as hoppits.
They are often vicious and spiteful creatures. Perhaps they have cause, having obviously been created because some god thought of a pun. Also they find the traditional pleasures of halflings very difficult: lighting a pipe really needs two hands, and if they eat too much they get too lop-sided and fall over. They also have poor depth perception.