Jaroenthong (nicknamed: Ped; เป็ด; lit: "Duck") was born in a family of fighters in southern Thailand.
Later when he grew up, he came to Bangkok for study at the secondary level at Wimutayaram Pittayakorn School in Bang Phlat neighbourhood.
He became a fighter at the camp "Kiatbanchong" which is owned by Chuchok "Mai Muangkhon" Chukaewruang, a fellow southerner.
He faced many top-line fighters in that era, such as Namphon Nongkee Pahuyuth, Cherry Sor Wanich, Wangchannoi Sor Palangchai, Namkabuan Nongkee Pahuyuth, Superlek Sorn E-Sarn, Petdum Lukborai, Therdkiat Sittepitak, Samransak Muangsurin, Chamuakpetch Hapalang, Ratchasak Sor Vorapin, Langsuang Panyupathum, Panumtuanlek Hapalang, André Masseur and the Dutch legendary Ramon Dekkers.
He faced his favorite senior fighter, Samart Payakaroon who at that time was to lose the WBC Super bantamweight world title to the Australian boxer Jeff Fenech and back to Muay Thai again.