No, the Carthaginians were not Greek. They were a Semitic people originally from the region of present-day Lebanon, specifically the ancient city of Tyre. Carthage, their most famous city, was founded in the 9th century BCE by Phoenician settlers.
The Carthaginians had their own distinct culture, language, and religious practices, which were influenced by their Phoenician roots. While there were interactions between the Carthaginians and the Greeks, including trade and conflicts, the two cultures were separate.
Carthage became a major power in the Mediterranean and was involved in notable conflicts with Greek city-states, particularly during the Sicilian Wars. This history has sometimes led to misconceptions about their identity, but it is important to recognize the Carthaginians as a distinct people with their own heritage that is different from the Greeks.