1900 Redland TWP Nevada Co has the only 2 Tongs listed in Nevada Co. They are Walter(?Horace Walter) b Jan (or Jun) 1890 and Etta Jul 1892 both in AR with father b MO. They are living with mother Sallie Worthington and her son James b Nov 1882 AR.
There is a Horace Tong in Little River Co as son of John F, Horace was b 1898.
As far as any info on Ernest W Tong, I do not find a single thing. I do find Elijah W Tong b 1839 MO who was in Miller Co AR 1880 with wife Rebecca, sons Wm H.,John, Jasper and Eliza(census states that). In the marriages for Nevada Co, there is one for EW Tong age 50 to Sarah Worthington 33 Feb 17 1889. That would make this EW the same age as Elijah.
Little River 1900 has John F and William H listed in Burke TWP, b MO. John F had a son b 1900 named Elijah Wood Tong.Also in John's household was Carrie Tong, sister in law age 21 who was married to E.D. Tong. John ended up marrying her in 1910 in LR Co.
Just in case you think Elijah and Ernest are the same, LDS has Elijah Tong as son of Henry David Tong and Elizabeth Woods b ca 1837-41 in Madison Co MO. His first marriage and mother of those 1880 children was Rebecca Downs who he married Mar 28 1858 in St Francis MO. In 1870 they were in Jackson Co AR. Mother Elizabeth was there with children Martha,Shelton,John, Nancy & James. Elijah and his family were next door with son George R as well as children already mentioned.
Also, Mar 27 1884 EW Tong age 45 married Martha E Cherry age 43 in Miller Co AR.