This is an Entbrat from a video game called My Singing Monsters.
The headpiece is made of foam core and bristol board, with horns sculpted from crumpled newspaper wrapped in masking tape. The whole thing is covered in felt. Lips, tongue, and teeth are made of craft foam colored with marker. The feet are craft foam covered with felt and the rest of the costume is just store-bought shirt and pants with felt leaves glued on and a belly button drawn on.