Welcome to BP.net!
What you are experiencing with your new snake is quite common, and nothing to worry about. As you've already seen, if something doesn't fit into your snakes mouth the right way, he will spit it out. It's very unlikely that your snake will choke on a rodent.
I urge you to move your BP onto the correct size rodent. You'll be surprised what they can consume with no problems.
Also, many BPs are a bit nippy or enthusiastic when they're young. It helps to keep in mind that when they are little, they're pretty low on the food chain, and they act accordingly. 999 times out of 1000 they all calm down over time and become lap snakes.
Good luck with him!
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