Yep. That is a freshwater dolphin. Specifically a Boto, Inia geoffrensis, the largest of the river dolphins.If we're gonna be really specific this is the Orinoco subspecies; humboldtiana.
Boto are weird. They're pink and pretty much blinf, they have extended rostrums as shown in the shot above, pretty well perfect for catching fish (cf gharials) and those rostrums are often goofily lopsided.