Pomegranates are native to Iran (the ancient Parthian Kingdom). During the Western Han Dynasty, Zhang Qian (about 164 BC to 114 BC) brought them back and introduced them after traveling to the Western Regions. Oracle bone inscriptions are characters engraved (or written) on tortoise shells and animal bones used by the royal family during the Yin and Shang Dynasties - the late Shang Dynasty (14th to 11th century BC) for divination and recording events.
You said that pomegranates did not exist in China at the time of the Oracle, and they did not appear until a thousand years later. Can the word "pomegranate" be included in the "Oracle Age"?
So, if you must use these two characters in calligraphy creation, you can create characters based on the involved radicals - create characters - create oracle bone characters for "pomegranate". This is allowed in calligraphy creation. of.