https://www.trade.gov/country-commercial-guides/nigeria-market-overview

I think the word emerging market is a macro-economic term used to contextual economies whose growth and investment potential are high but fall slightly short of other parameters to measure developed economies (for some countries while others are far from developed countries). So when you use it to suggest new markets in Nigeria, then it loses its absolute relevance.

Are there absolute NEW MARKETS in Nigeria? Well be not new but I think the creative industry in Nigeria is one of them, FINTECH and Smart farming also fall within the category.