Yes, the Ferengi never refer to themselves by name in Acquisition, which is in keeping with them being secretive as shown in the Last Outpost. Remember, the Ferengi weren't unheard of, just unseen. The Federation had no problem identifying Ferengi ships and had a good grasp of Ferengi society, it's just that no one had actually seen an alien calling themselves "Ferengi", Once they had a face to go with the name, I imagine several encounters with "unknown aliens" were retroactively attributed to the Ferengi.
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