Forward Toni Rajala and Fedun scored two points each for the Barons. Arcobello added a shorthanded goal.
Rajala gave OKC a 1-0 lead late in the first period. Rajala intercepted a pass and turned the Rockford turnover into a goal by firing the puck into a tight window past Hogs goaltender Carter Hutton.
After the IceHogs tied the game early in the second period, Arcobello scored the Barons' fifth shorthanded goal of the season on a breakaway.
Rockford tied it 2-2 late in the second period, but OKC answered with a tick-tack-toe goal from Josh Green to Rajala to Fedun.
“We really executed that three-on-two nicely,” Fedun said. “We got it to Green on top, he got it back down low to Raji and he got it to me on the backdoor. It was a couple of inches off the ice and I whacked at it.”
It was one of the few whacks the Barons had all night.
Oklahoma City was outshot in every period — 14-7 in the first period, 12-6 in the second period, 10-1 in the third period.
“For them to own us like that where we can't even execute simple plays is pretty disappointing,” Nelson said. “But give Rockford credit. They played a strong game and have been playing very well. They never quit. We have to be a lot better.”