Yes, whales poop and release toxic excrement from their body as do all marine mammals; and pretty much all known animal species for that matter.
In fact pooping or removing toxic chemicals/substances (waste) from the body is necessary for the survival of almost all known animal species, while plants on the other hand absorb light, bacteria and water in order to produce oxygen.
Animals consume various types of food in order to provide their body with essential nutrients that keep the body healthy, energized, running efficiently and most importantly keeping them alive.
The healthy and nutritious parts of their food get broken down, sorted out and absorbed into different parts of the body based on how they affect the body and how the body can use them for energy/repair while the non nutrient or toxic parts of food get removed from the body through a biological process that breaks the toxic/non nutrient parts down and often ends with the animal pooping out the harmful waste in order to remove the excrement from their body.
When a whale releases its excrement the whales poop comes out as an almost liquid form of fecal matter (often in a plume like cloud) and is light enough that it does not sink but floats across the top of the ocean.
According to our understanding if a whale needs to poop it has to travel to the surface of the water to relieve itself because when a whale takes a dive it shuts down its none crucial biological functions so that it can focus on other activities.
One of these non crucial functions is the ability to poop which explains why whales only poop at or near the surface of the water, not when they are hundreds of feet down.
Since whales must come to the surface for oxygen they are likely to visit the surface frequently enough to relieve themselves whenever they need to.
Research has found that a whales poop is extremely earth-friendly and necessary for a healthy environment.
In fact whale poop is very important for the ecosystem and various forms of marine life such as phytoplankton.
The nutrient rich fecal matter feeds phytoplankton (plants) which allows it to grow and prosper.
As the phytoplankton grows it pulls more and more carbon dioxide from the atmosphere cleaning up the environment and creating a healthier eco system for both land and oceanic animals.
The carbon that gets pulled from the environment stays trapped inside the phytoplankton for as long as it lives which could be for several millennium.
An unfortunate side effect caused by the whaling industry (other than causing many species to become endangered) is a huge loss in nutrient rich whale fecal matter due to the slaughter of hundreds of thousands of whales which would have aided the ecosystem greatly in terms of the growth of phytoplankton and the reduction of carbon dioxide in our environment.
In fact the large decrease in available whale poop, which as we stated earlier feeds phytoplankton, has led some individuals to debate several concerns regarding the effect this is having on the reduction of clean oxygen in our environment.
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