Frogface was an "imp" summoned from the demon worlds and bound by Soulcatcher. Among his many magic talents was the ability to disappear and materialize in a new location in an instant, the power to cleanse poison from human blood, and the capacity to understand apparently any language. But, despite his many powers, he was "forbidden to take life" under any circumstances. He was an excellent ally of the Black Company for a time, but was ultimately Soulcatcher's most effective instrument in her plot to bring heartbreak and misery to her hated sister, Lady.
Soulcatcher secretly planted Frogface in a wizard's shop in a bazaar north of the Third Cataract. His appearance was made to look like a shrunken version of Goblin, a minor wizard in the Black Company with whom One-Eye was eternally butting heads. As predicted, this opportunity to embarrass Goblin was irresistible, and One-Eye purchased the imp. Following Soulcatcher's orders, Frogface feigned to be commanded by One-Eye, and was now a source of endless humiliation for Goblin.
In the service of the Company, Frogface was very useful, serving as a translator and spy when the Company descended south to Taglios, even as he sowed some measure of mischief in the Company ranks, leading to a conflict between One-Eye and Goblin. Croaker divined his true allegiance to Soulcatcher even before it was revealed, but could do nothing about it.
Frogface performed important reconnaissance for the Black Company during the Battle of Dejagore. He spied on the occupiers loyal to Stormshadow within the walls of the city, and then assisted a strike force in opening the gate, to permit armed former prisoners to rush in and liberate the city. The next day, however, during the disastrous final clash of the battle, Frogface was nowhere to be found. Lady surmised that he could be used to slice through the enemy army to great effect, but was frustrated and confused that he was missing from the melee. She did not yet realize that the imp was in the service of her sister.
Dreams of SteelEdit
When Frogface's mistress Soulcatcher was masquerading as her sister Lady, she was kidnapped by the Howler, who did not realize he had the wrong Senjak sister. It took Frogface five days to locate his mistress. She had been delivered to Longshadow at Overlook, which was unsettling even for Frogface. Longshadow was dreaded in the demon worlds, but after considering leaving her there, he persevered. He materialized in her cell, removed some of Soulcatcher's blood, purified it of the sorcery drugging her mind, and restored it to her veins. Now at her full power, she ordered Frogface to go prevent Croaker from reuniting with Lady. Frogface was disappointed to still be bound to her, especially when he did not have to return and rescue her in the first place. But Soulcatcher assured him that she would grant him his freedom very soon. He departed enthusiastically, and soon destroyed a bridge, keeping Lady and her husband apart.
Soulcatcher, having escaped Overlook alone and on foot, reunited with Frogface later in a field outside New Dhar. She knew that Longshadow was sending a gigantic killing shadow to dispatch her, so she had Frogface assist her in one final task before she would set him free. Frogface took her appearance, and materialized one new spot after another for a few hours. It could kill Frogface if it caught him, but he would be safe if he kept ahead of it, which he could do indefinitely if he remained alert. The shadow, though immensely dangerous, was a mindless entity and simply kept persisting. Frogface lured it to places where it would kill and terrify key populations within the city, as part of Soulcatcher's plan to cause anti-Shadowmaster sentiment in New Dhar to boil over. They finally trapped it in the governor's vault, which Catcher specially prepared. Frogface was greatly amused by their last mission, but reminded his mistress that he had business in his "own world" to attend to. They departed together, "laughing like children". Catcher presumably released Frogface to return to his world as she had promised once they reached the city limits.