'TMZ Hollywood Sports' -- SNOOP DOGG ENDORSES PEYTON ... Pizza + Weed = Genius!!!

Snoop Dogg says Peyton Manning is BRILLIANT ... at least when it comes to pizza, because opening 21 pie shops in a state where weed is legal is a BOSS move.

The rapper joined the gang on the "TMZ Hollywood Sports" TV show Wednesday -- and told us he's following Peyton's lead to capitalize on munchie-mania in Denver!

Make sure to check out the brand NEW episode of "TMZ Hollywood Sports" on Reelz -- every weekday at 8pm ET, 5pm PT.