Could 2 Cherry Barbs fit in a 1 gallon tank?

Not a chance. They are active fish that like living in schools and would be miserable in such a tiny tank. The only fish that could comfortably live in a tank this size is a betta. Even a betta should ideally have a bigger tank, but will be comfortable in one gallon if 70% water changes are done weekly, RELIGIOUSLY. NEVER skip a water change.