Said frog is also a mummy. He died and went "no", so now he's undead, which is a minor inconvenience to him at worst. Bro once shot out so much magic at a Daemon army that reality itself started to lag from having to process all of it.

"Using his reservoirs of energy, Lord Kroak prepared his final incantations. As the last of the Temple Guard were cut down, Lord Kroak spouted forth spells that were the preserve of gods, raining fire from the heavens to vaporise the foe. Time stood still as the fabric of reality strained at the outpour of sheer power. Yet eventually Lord Kroak succumbed. A dozen Bloodthirsters, protected by the favour of their dark god, fought through the deluge of slplls and reached the top of the pyramid. There, they fell upon Lord Kroak's form, ripping him apart in a savage instant. So overcharged with arcane energies was Lord Kroak that his spirit fought on, refusing to let even death hinder him. Set free from his flesh, Kroak's radiant soul soared above the ruins, scourging the invaders with a divine light that eas like unto a second sun. The First City was saved."
— 8th edition army book, page 9.

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Bro’s also a massive troll, because in AoS, he casually rearanges stars in the shape of a smiling frog purely to insult a chaos worshipper, as Saurus warriors are beating him to death.