Conversation so far:
who sang you're a mean one mr. grinch in the iconic 1966 animated tv short
The song You're a Mean One Mr. Grinch was performed by Thurl Ravenscroft.
was the voice actor Thurl Ravenscroft known for any other roles besides mr. grinch
Thurl Ravenscroft is known as the booming voice behind Kellogg's Frosted Flakes animated spokesman Tony the Tiger for more than five decades.
when did Thurl Ravenscroft's voice acting career begin
Thurl Ravenscroft's voice acting career began in 1940.

Question: what did the voice actor do before voice acting
Self-contained rewrite: what did Thurl Ravenscroft do before voice acting