It's possible that "pepas lumpia" might be a lesser-known or regional twist on the traditional lumpia. Typically, lumpia comes in several popular varieties: lumpiang shanghai, which is fried and often filled with pork, veggies, and sometimes shrimp; lumpiang sariwa, with fresh ingredients wrapped in a soft crepe-like wrapper and topped with a savory-sweet sauce; and lumpiang ubod, filled with heart of palm.
Local variations often bring unique twists to these popular staples, incorporating specific ingredients or spices that reflect local tastes. Sometimes, these variations can use different types of meats, seafood, or even vegetarian ingredients that aren't usually included in the more common versions.
Until we gather more specifics about what "pepas lumpia" could be, maybe you could experiment by incorporating some regional flavors into a lumpia recipe you already enjoy. For instance, adding local herbs or spices you encounter in specific regions of the Philippines might mimic what pepas lumpia offers. If you ever discover what makes "pepas lumpia" unique, do share it here; I'd love to learn about it too!