Sayyiduna Wa'il bin Hujr (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Do not call grapes 'Karam', rather call them 'Inab' or 'Habla'."
Hadith Referenceسنن دارمي / من كتاب الاشربة / 2151