With regard to horses and donkeys a "mule" is the offspring of a male donkey and female horse [1], while a "hinny" is the offspring of a female donkey and a male horse [2].
There was an article in The Atlantic with a bit more info, but the hunter that killed it initially called it a narluga. That stuck in spite of the convention being backwards: the genetics suggest the mother was a narwhal, which would make this particular combo a belwhal by the standard convention.
Meat in Cetacea is red, strong and similar to beef, but fish flavoured. Would be like eating a beef fried on fish oil. Sounds a little gross to me (but anything with a high fat content would taste delicious if you are in the arctic).
On the other hand, some Beluga meat is classified in the Toxic waste category so, probably not a good idea. They are prone to accumulate contamination byproducts and heavy metals in blubber
narlugas
belwhals
..?