No, mummies were generally not found inside the pyramids of Giza.
While pyramids are commonly associated with mummies and elaborate burial rituals, the pyramids of Giza, including the Great Pyramid of Khufu, did not contain mummies when they were entered in modern times. Although Khufu's pyramid has underground tunnels and a central burial chamber accessible via a tight passageway, explorers found no hieroglyphic texts, treasures, or mummies within.
It's important to note that while mummies weren't typically inside the main pyramid structures, the burial complexes often included other structures, like tombs in the Valley of the Kings (for later pharaohs), where mummies were indeed found. The pharaohs intended to be buried with riches and treasures for the afterlife.
In summary, the popular image of finding mummies directly inside the main chambers of pyramids like those at Giza is largely a misconception. Mummies were often part of the broader burial complex, but not specifically within the pyramid structure itself.