Conversation so far:
When was Kermit the Frog born?
Introduced in 1955,
Where was Kermit the Frog born?
Leland, Mississippi
Does Kermit the Frog have any siblings?
approximately 2,353 siblings
Did Kermit the Frog leave Mississippi?
Kermit the Frog was the first of his siblings to leave the swamp, and one of the first frogs to talk to humans.
Does Kermit the Frog go back home?
Kermit the Frog returned to the swamp
Is there a movie about Kermit the Frog childhood?
Kermit the Frog's Swamp Years
How did Kermit the Frog meet the other Muppets?
Kermit the Frog headed to Hollywood, encountering the rest of the Muppets along the way.

Question: How did they get into movies?
Self-contained rewrite: How did The Muppets get into movies?