Hedorah

"Hedorah's gurgling roar comes from Kemular, a poison gas monster from the original Ultraman series. When feeding on toxic fumes, Hedorah makes breathing noises that are recycled from Gezora and later reused for the Ultra Series kaiju Garan. In addition, it utters several high-pitched laughter-like sounds, mostly in its Perfect Form. In Godzilla: Final Wars, Hedorah's roar mostly remains the same, but it also emits sounds that are similar to an elephant trumpeting that has been lowered in pitch, and its roar now echoes."