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Snap was originally a scratch fork back when both of them were written in smalltalk, but they’ve both since gone through independent rewrites.

The Snap! mascot is named Alonzo after Alonzo Church, and the "horn" is a lambda to symbolize Snap!'s functional programming features. I just checked, and both Alonzo and Gobo have three feet.

"Sprite" and "costume" are distinct concepts in both Scratch and Snap!. A costume is a texture, and a sprite is an actor associated with state such as a current costume, as well as program logic.

The advanced features are there - like making API requests, Lambdas and real custom blocks/functions. Beyond, that you can write in JS to extend Snap! within itself.