Adorable! Is he a hypo, or just a really light normal?
I LOVE corns. My first reptile (still have her) was a corn. They easily rank among my favorite snake species. They're also probably one of the species I'm most knowledgeable about, considering it's the one I've had the longest and I read everything I could about them when I got her. Lol
Sorry to hear about your regurge. Watching your handling after meals is definitely important. I like to wait 2-3 days after a meal to handle. 2 days is the minimum. I usually wait the extra day or two so they have a chance to poop--that way it doesn't happen on me (which, I've had happen--my big girl pooped down my shirt once. Among other various "the snake pooped on me" stories, that one was probably the nastiest... LOL. NOT fun!) So did he come back from the regurge pretty well? (Only now realizing the last post was almost 2 weeks ago... heh)
One note on feeding, as I see you guys were discussing it. With hatchling corns, you're looking at a single pinky mouse every 5-7 days, moving up in size and farther apart in days as you go. Frost looks big enough, based on the pics, to take a smaller fuzzy or 2 pinks per meal, at which point you'll start moving to every 7 days. You want the meal to be about 1.5x the widest part of his body. Basically, if it doesn't make a lump, or the lump disappears within 24 hours, then you want to move up to the next size (or, in the case of pinks, double up for a few meals, then move to the next size up). There's also a guideline called the "Munson Plan" that gives feeding size suggestions based on the size (weight) of the snake. It's a very good guideline if you just don't want to guess, as long as you remember that it's not set in stone and it doesn't always apply--there will be snakes that are more sensitive and can't move up on meal size as fast as "normal."
Adults will take regular adult mice, once every 7-14 days, depending on your snake, its gender/whether you're breeding (males less often, breeding females more often), and little things like that. My girl, at around 400 grams, 3.5ish feet long, and non-breeding (at the moment--fingers crossed a good male for her pops up at the expo!! Otherwise she's waiting 2 years for my Hypo Lav to be breeding size), takes a single adult mouse every 7-10 days.