The Sleeper symbiote, brother to Carnage, takes the form of a wolf and slobbers some liquid on the Carnage-symbiote controlled Maker. Turns out Sleeper can create any chemical from his body, which includes napalm, and Hawkeye blasts him with a fire arrow of sorts. First time for me to read about a symbiote that can produce chemical.
From – Venom Vol. 4 #19