You can find many names mentioned in the list in Orin G. Libby’s book The Arikara Narrative of Custer’s Campaign (University of Oklahoma Press). I found there the following information about some of the Arikaras:

Boy Chief: brother of Red Bear; photo of him in the book. (I didn’t find if he was named Black Calf also.)

Red Star: (a/k/a Strikes the Bear) born 1858 at Fort Clark; father: also Red Star; mother: Women-Goes-Into-Every-House; fought with Reno; from 1898 to 1901 he was on police duty. He changed his name to Red Star after the Little Bighorn battle! (His detailed narrative, his biography, and a photo are in Libby’s book.)

Bull-Stands-in-the-Water: also named Bull in the Water; leader of the Arikara Da-roch-pa Society.

Charging Bull: captured a horse herd during the battle together with Bull, Red Wolf, and White Eagle.

Red Wolf: see Charging Bull

Scabby Wolf: he and Left Handed were sent back to Fort Lincoln with mail when the Custer column was in the Little Missouri region and later returned with mail from the fort.

Tall (High) Bear: was enlisted by F.F. Gerard among several others of Chief White Shield’s police force; had a dispute with Reno during the march to the Little Bighorn. Reno ordered some scouts to stay behind because their horses were worn out. Tall Bear protested and even started for Reno with his knife. Bloody Knife sprang between and saved Reno. (This incident is also described by Ben Innis in Bloody Knife – Custer´s Favorite Scout.)

Pretty Face: when the mule train with supplies was left behind, Pretty Face was detailed on the duty of looking after it; after the Reno battle the scouts assembled what to do and by then Pretty Face had already joined the others from the pack train.

Charging up the Hill: no information.

— Dietmar Schulte-Möhring

Born in 1839, Dakota Territory
Enlisted with the Seventh Cavalry on April 27, 1876
In valley and hilltop fights at the Battle of the Little Bighorn (June 25-26, 1876)
Died in 1894

— Diane Merkel

Forked Horn is mentioned in “The Arikara Narrative of Custer’s campaign and the Battle of the Little Bighorn” by Orin B. Libby (editor) several times.

He was one time the leader of an Arikara scouting party during the march to the Little Bighorn valley. Later he was in the fight with Reno, fighting in the brush along with Young Hawk.

After the fighting Forked Horn, several Arikaras, Varnum, Gerard and others went down to look for Custer’s body. Then he volunteered with Young Hawk to go to the deserted Sioux camp for dried meat. There they found the body of a scout they thought was Bloody Knife. (See narrative of Young Hawk.)

It is also stated later in the book that Forked Horn was the father of Young Hawk. He was born about 1815 (?) and he died in 1894.

— Dietmar Schulte-Möhring