Look at kitchen equipment, plenty of bigger grabbers there. I personally use small hemostats for small feeders and my big needlenose pliers that I have for musky fishing when I feed big feeders (lg rats and bigger).
Some people who do lots of field herping may have a "snake grabber". Those work just fine as feeding tongs, if pricey for only feeding purposes.
Once you feed things the size of big rabbits, grabbers really aren't feasible, at least from my personal experience with feeders over 5lbs.