Since there is no common amphibious hybrid, this would be capable of the S-hybrid being moved to an amphibian.
This is vastly inferior because the spinoraptor has slightly better stats, and the Carnoraptor is close enough to make this a moot choice when fusing. Plus now that the spinoraptor has its spinotasuchas, the Metrialong s-hybrid could be a more tanky carno.
This is a similar case to the metrialong but this time the tapejalosaurus has far better stats and thus this feels like a worthless hybrid that needs to be made better.
While I believe the Ostaposaurus is literally perfection, we need more alternatives to counter the super strong tourney-hybrid-carnos at a S-tier level. This would be the perfect opportunity to make a tanky amphib. I guess the Koolasaurus would be a decent second pick but I still prefer the former.