No, most devils hide their true name with extreme secrecy.
According to Tanetal's entry at the Forgotten Realms wiki, Tanetal's habit of peppering his speech with Latenat, his own name backwards, is a trait peculiar to himself, and not a typical part of true name lore.
According to AD&D 2e's Faces of Evil (1997), p. 7, devils and all other creatures possess a true name, or secret name. Devils go to extreme lengths to avoid allowing anyone to discover their true name, and would never utter it unless somehow compelled.
The Planewalker's Handbook (1996), p. 111, notes that true names are "closely guarded secrets". Learning a creature's true name requires arduous research, and only a few have been catalogued. This strongly suggests that most creatures, particularly those as intelligent as pit fiends, protect their true names by more reliable methods than simply speaking it backwards.
The secrecy with which creatures guard their true names is attested at least as far back as the AD&D 1e Unearthed Arcana (1985), and at least as recently 3e's Book of Exalted Deeds (2003) and Tome of Magic (2006).
A true name is more than just the creature's common name, but rather a secret name. For example, one Forgotten Realms novel gives Mephistopheles' true name as Thra'axfyl the Ambitious.
I also can't think of any other D&D work, Forgotten Realms or otherwise, where a demon or devil peppers their language with their own name.