Inspired by a recent post here, as well as my recent dna test saying I am over 1/4 French. It is so unexpected because it comes from my father who was born in Guatemala, and his parents were too. I always thought it was mostly the Spanish who settled there while the French were more northern, but this has thrown my limited knowledge of European settlers for a loop.
No, the French did not have colonies there. But, there could be several explanations with historical basis.
The data used by the test is based on other people's data and the ancestry they declared. Since there is a huge margin for error there, one possibility is that you have Basque ancestors. The Basque region spans between modern France and Spain, but the test may attribute some markers common to Basques as French. The Basques were heavily represented in Spanish America for a variety of reasons. The region had a lot of trading interests and many Basques immigrated to the Americas as merchants. Basques were also heavily involved in Atlantic seaborne trade.
It could be French. After 1713, the Spanish monarchy passed to a French prince of the house of Bourbon. The new monarchy maintained ties to France and frequently appointed French men to bureaucratic and military posts. From the 18th to independence in the 19th c. many French names appear as colonial officials in Spanish America. It could be that you descended from a Frenchman who entered Spanish America during this period.
There could be many other explanations including French immigration after independence. In the 19th c. French, English, and German corporations received lots of contracts for infrastructure development in Latin America. You may be descended from a forebear who arrived during that era as well.