The answer(s)
2020-02-08: Yes, they are !

2020-02-08: It dates back from 700 years ago

The story
The Nazario Collection, Father Nazario's Rocks and the Phoenician Rocks (Spanish: Piedras Fenicias), are a cache of carved stones that originated at Guayanilla, Puerto Rico. According to contemporary accounts, the statuettes made of local serpentine rocks were first discovered by Catholic priest José María Nazario y Cancel during the 19th century, and feature unidentified petroglyphs that have been speculated to be connected to the Old World for over 130 years. Their original site was not far from Yauco and was underground, where it was hidden under a slate that concealed a tunnel. Overwhelmed with the quantity and difficulty of transporting a trove that totaled more than a ton, he opted to abandon his individual approach and recruited locals to aid in the moving of the rocks to his house, where he conducted the first research on them by comparing them to similar objects from other countries. Nazario would combine his research with his religious background, leading to the hypothesis that there might be some connection between them and the Ten Lost Tribes.