Yes, you can use lentils of your choice to make khichdi. I have already shared the recipe for moong dal khichdi on my blog which is made with split and skinned mung beans. You can also make it using other lentils like red lentils (lal masoor dal), brown lentils (sabut masoor dal), white lentils (dhuli urad dal), or split Bengal gram (chana dal). The cooking time may vary depending on the type of lentils you are using.