Delbert the La Choy Dragon appeared in television commercials for La Choy chow mein from 1965 to 1967. In some commercials he was teamed with Mert, a meek, bespectacled Muppet spokesman.
Though originally built as a live-hand character, in 1966 he was rebuilt as a full-bodied character to engage with live actors in domestic settings. The puppet was capable of emitting fire from its mouth, creating a unique effect in the commercial he appeared in.
Frank Oz, who puppeteered the La Choy Dragon to Jim Henson's voice, notably hated performing inside the full-body suit.
Although he's not named on screen, Delbert's name is documented elsewhere. 
The character was originally conceived as a large bird; Henson filed the drawings away, for later possible use.