Will my Betta die because of this?

I have 2 African Dwarf Frogs and 1 Betta male that share the same tank. I've had the ADF for a bout a month or so and they seemed to be getting along fine with Moltres (fish). A few days ago Morgerath (one of the ADF) died. It makes me sad to I try to have someone else get him out of that tank because looking at him freaks me out. I read that I needed to get him out soon because he would pollute the tank. It's been around 3 days and my dad said he would get him out today after work. I woke up this morning to find Moltres swimming around the bottom of the tank where the body was laying. I go suspicious so I went to check it out. It turns out that Moltres ate Morgeraths body! I don't know if that's normal. Now that he's eaten one ADF, I'm scared that he'll eat Faeriat (my other one). Even though he's alive and not just sitting dead at the bottom of the tank. Also, will my Betta die from this? I don't know how healthy it is for a fish to eat a 3 day old dead frog. PLEASE HELP!!!!!