According to Dictionary.com, "a hired hand who tends cattle and performs other duties on horseback". So basically someone who does all that cowboy stuff on a ranch with cows. See also Western.
The new guy everyone makes go on Starbucks runs.
Job held by Batman, Deputy Dog, Sherlock Holmes, Encyclopedia Brown, T.J. Hooker, and others.
Yoo-hoooo! Be a doll and add a funny job.
Someone who studies frogs (and reptiles and other amphibians). See also Science.
"Hey, uhh, wanna buy an anvil?"