Mutter dal in English typically refers to split green peas.
Mutter dal, also spelled Matar daal, is a type of lentil made from green peas that have been peeled, dried, and split. It's a common ingredient in various Asian and African cuisines, and a staple in Bengali pantries, where it's often served as a side dish with plain rice. So when you see "mutter dal," you're most likely looking at split green peas.