Definitely. *puts on dog food nerd hat*
PureVita has three formulas (turkey, bison, or salmon) that are made with potatoes and peas.
Instinct has four formulas (duck, lamb, turkey, or rabbit) that are made with tapioca and peas.
Wellness has a salmon/potato and a turkey/potato in their Simple Solutions line.
Natural Balance has several LID formulas that are grain-free - duck/legume, duck/potato, rabbit/potato, bison/sweet potato, chicken/sweet potato, fish/sweet potato, and venison/sweet potato.
Blue makes a turkey/potato in their Basics line.
I know you said grain-free, but the Acana Singles line makes a duck formula and a lamb formula - both use oats, though.
My top choices would probably be PureVita, Instinct, or Acana (assuming the oats are okay), just personal preference.