The dolphins drafted thomas in the 5th round in the 1996 nfl draft. So the answer to your question is he didn't play for anyone before the dolphins, unless you mean college and in that case he played for Texas tech.
Texas tech
Daniel Thomas plays for the Miami Dolphins.
Dallas Thomas plays for the Miami Dolphins.
Dallas Thomas plays Guard for the Miami Dolphins.
Demaryius Thomas plays Wide Receiver for the Denver Broncos.
Zach Walters plays for the Washington Nationals.
Zach Line plays for the Minnesota Vikings.
Zach Moore plays for the England Patriots.
Zach Bogosian plays for the Winnipeg Jets.
Zach Britton plays for the Baltimore Orioles.
Zach Minter plays for the Cincinnati Bengals.
Zach Randolph plays for the Memphis Grizzlies.