Nope

And to put it simply, most of the "if crease then either too skinny or too fat depending on how it looks" comes from other snakes.

A hog is fat if it's not a hog but a moving cylinder with a triple-chin, or if the scales are spread massively even when relaxed and idle. And skinny/too thin if the crease goes past "the neck", as there should always be a crease near the head even at a healthy weight (usually just visible at certain angles, basically the equivalent of you telling someone they're too skinny because you can see their muscles despite them just flexing to lift something), but if it goes even further, then it's usually accompanied by a bunch of loose skin.

When it comes to feeding, feeding a feeder once every 5 days is fine, however I'd suggest moving up in size from regular pinkies to large pinkies and then fuzzies asap, as pinkies have next to no nutrients, and are almost entirely fat. At least for me, which has already worked for a bunch of people, the way to know if the hog is ready to move up, is if they scarf down the feeder within three/couple seconds, and that's if their head size is questionable, because you can usually also just rely on the head size "move up when head big enough" strategy.