This is about the character. If you are looking for the company, See Big Potato Games. If you were looking for the potato in Asdfmovie and others, See Potato.
Big Potato is a character in the video It's Muffin Time. He appears, proclaiming "I'M A PROFESSIONAL GAME PUBLISHER!" poking fun at the name of the manufacturing company for the upcoming card game Muffin Time. He later appeared at the end of the video squishing Mr. Muffin.