Oh yeah he is.

Is Flea from RHCP in Guardians of the Galaxy?

There are also other musical cameos too: Mindless Self Indulgence's Jimmy Urine is a Ravager and so is Flea from Red Hot Chilli Peppers.

What happened to fleas teeth?

Later that year, he rejoined the struggling Chili Peppers at Flea's behest. At this point, he had suffered five near-fatal overdoses, and his teeth were so utterly destroyed that the dental bill was $90,000.