I'm surprised myself, but yes. There is such a hero: Timerkhan. He is in the resource database, but for some reason, he is disabled by default. His specialization is quite strange; I don't quite understand how it works. It somehow moves creatures along the ATB scale. It triggers at the beginning of the battle and in any turn of the hero if he applies it.
Added 1 minute ago
it shifts all friendly creatures along the ATB scale