At least one kid is holding one in his hand and there is no butter or white sauce, so not chicken kiev or chicken cordon Bleu. Hush puppies are spheres and the size of donut holes or bon bons. These are bigger.

They look like croquettes. As folks have been confirming in this thread, the 70s had a lot of fried food that was roughly hotdog/baseball shaped. Croquettes would be an easy way to mix protein and veg in a kid friendly way.