Yes — cooked lentils are an excellent plant-protein source for parrots. Cook them thoroughly; raw lentils, like all dry legumes, should not be fed dry.
Keeper's noteCook plain and mix into chop, or sprout them. A cheap, healthy protein boost especially valued during molt.
Why lentils is good for parrots
Cooked lentils are protein- and fiber-rich and easily digested, making them a great chop ingredient. As with all legumes, they need cooking — though lentils are also among the easiest and safest legumes to sprout, which is another good way to serve them.
How to serve it
Cook thoroughly, plain, and cool before serving.
Or sprout them — lentils sprout easily and safely.