Hey 4Kingzeus,
One of the biggest problems with feeding frogs, reptiles, or any other amphibians is that it easier to transfer parasites from reptiles and amphibians to your snake. Most if not all parasites are killed with frozen/thawed mice. Its also alot less likely with live mice to transfer parasites. Most parasites that live in mice cannot tolerate the stomach acids and digestive system of a snake. If your feeder lizard or frog or whatever has parasites the transfer is much more easy because they are similar species.
But here is really the biggest problem with feeding other than mice. AVALABILITY. Even if money is no object petco or whomever cannot possibly provide you with enough "stuff" to feed your snake. ALL of us here take great pains getting our kingsnakes and milksnakes babies to feed on pinky mice.
In your first post you mentioned that you wanted HELP and that you wanted a BIG STRONG HEALTHY SNAKE and you wanted some TIPS.
Here are three TIPS.
1 DO NOT feed you snake other reptiles, amphibians or birds.
2 Only feed you snake mice or rats.
3 Buy some books on the care and feeding of your kingsnake. Here are 2 good ones. "The general care and maintenance of Common Kingsnakes" by David Perlowin or "Kingsnakes and Milksnakes" by Ronald Markel & R D Bartlett. There is also good info on this site under "Care sheets/FAQ's/Features"
As for a heat source you would be better off buying a heating pad and setting it on "low" and putting it under your snakes enclosure, but under only part of it. Your snake needs a warm place, a cool place, a hiding place and water. He also needs a VERY SECURE enclosure. Snakes are expert escape artist.
You have a great looking kingsnake. Good luck with your snake.