The wave base was designed in Blender following this tutorial by Bbbn19. The dolphin model I found on thingiverse by nap. I then took the model, duplicated it and transformed it a bit, then performed a Boolean operation in Blender to create cutouts for the dolphins. This was all exported, then the dolphins were oriented appropriately as STLs and scaled down by 1% to ensure fit in the wave_base.

I recommend printing with a fine layer height to capture the curvature of the waves, and supports are necessary for the dolphins.