Lempeng is basically a coconut pancake, bro. Flour, fresh grated coconut, a splash of water, and then fried on a griddle with oil. It is a kampung-style breakfast or afternoon snack that a lot of people outside the Peninsula or rural areas might not have had before. At 155 calories per piece it is actually pretty reasonable for a snack, and the grated coconut is doing most of the calorie work at 60 kcal out of the 155. Worth flagging though: these numbers are a ballpark estimate because there is basically no proper lab data on lempeng out there. Different grandmothers, different coconut ratios, different amounts of oil on the griddle. Treat it as a solid guide, not gospel.
What actually moves the number is the oil on the griddle and what you eat it with. A griddle-cooked pancake absorbs maybe 1 to 2g of oil, which is about 15 kcal, but a heavier-handed cook re-greasing the pan constantly can push that higher. The berlauk version with rendang or curry chicken on top can jump to 220 calories or more because the lauk alone adds 40 to 70 kcal. If you are tracking, eat it plain or with just a sprinkle of sugar, skip the second piece lah, and go for the pisang version if you can find it since it saves you about 25 calories per piece.