You could use alot of things for treats. Tyson likes all this stuff:
apples, bananas, strawberries, liver treats, wellness treats, jerky treats, small pieces peanut butter bread. Pretty much anything. I am now making him freeze dried liver treats. I just got the liver today, boiled it, cut into pieces, lay on cookie sheet until frozen, then put in an uncovered container in freezer for about a month. Hope it works well. If it does, I may try doing it with chicken next.
Some others will be offering some ideas too.