These are Skywalker Sound sound effects consisting of 2 medium explosions. They debuted in Star Wars: Episode V - The Empire Strikes Back (1980) and were recorded by either Ben Burtt and/or Randy Thom. It seems to be considered as a stock sound effect though.
Links:
https://soundeffects.fandom.com/wiki/SKYWALKER,_EXPLOSION_-_BIG_CRUNCH#Audio_Samples
SKYWALKER, EXPLOSION - BIG CRUNCH has been suggested to play 3 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.
