This sound effect can be found on The Edge Edition Volume 1, which was made by The Hollywood Edge. It is an edited version of Sound Ideas, ELEPHANT - TRUMPETS IN JUNGLE, ANIMAL 02 from the Hanna-Barbera Lost Treasures Sound Effects Library (made by Sound Ideas).
Links:
https://www.audiomicro.com/animals-wild-elephants-trumpet-an-te016001-sound-effects-130019
https://soundideas.sourceaudio.com/track/11487849
https://soundeffects.fandom.com/wiki/Hollywoodedge,_Elephants_Trumpet_An_TE016001#Audio_Samples
