The only Croatian nobles which ruled Bosnia (after the fall of the Croatian state in the 11th century) are sthe Subici. There were some wars between Bosnians and teh Croatian Subic family but we don't know the outcome of those wars. The sources are very think concerning those relations between the Kotromanic and the Subic. All we know is that the Subici called themelves "rulers of all of Bosnia" in the time of Stijepan Kotroman. But historians think that they only put that into their title and did not control really "all of Bosnia" but only the western part of it. After those wars and those territorial pretensions from the Subic family we know that Mladen I Subic was killed by the Bosnians. The sources mention "heretic Bosnians who killed Mladen I Subic." We know that Kotroman met Mladen before at the banks of the Drina river. This means that he had to come from the north and tried to penetrate into the "real land of Bosnia" or the "small land of Bosnia" (horion Bosona as the DAI calls it.) May be he conquerred really all of Bosnia in that time? We will never know for sure. To me that would be not logical because if he conquerred really the real hearth of Bosnia then how would Bosnia ever manage to regenerateitself; to kill Mladen I? We should not forget that only 15 years after the Subici call themleves "rulers of whole of Bosnia" the Bosnians re-conquerred all the northern provinces and also annexated the Serbian Hum and reached the sea at metkovic. And 10 years after that Stijepan Kotromanic II added to his title also Livno and Duvno and called himelf: "The ruler of all Bosnian lands from Sava to the Cetina and sea-side."
We really don't know much. We know only that Kotroman choose one side of the Hungarian political spectrum and Mladen I Subic choose the opposition in Hungaria. But it seems that Bosnia was on the edge of existence during those Subic pretensions but managed to recover itself after this.
Frankopans were not really a thread I think. Only Subic and that was it.