“What happens when frogs park illegally?”/“They get toad.”

A frog joke has been cited in print since at least 1982:
 
Q: What happens to illegally parked frogs?
A: They get “toad” (towed) away.
   
The “toad” pun has been printed on many images.
 
     
24 January 1982, The Arizona Republic (Phoenix, AZ), “Kids tickle funny bones,” pg. D8, col. 5:
David Foster, 8 third grade
St. Francis Xavier School
What happens to illegally parked frogs?
They get “toad” away.
 
Google Books
February 1983, Boys’ Life, “Think & Grin,” pg. 72, col. 2:
Princess: What will happen if you illegally park a frog?
Policeman: It will get toad away. — Hans Riemenschneider, Homewood, Ill.
 
26 November 1983, The Star (Anniston, AL), “The Good Life” by George Smith, pg. 7B, col. 4:
TODAY’S CORN: Illegally parked cars get toad away.
 
17 October 1987, The Times (Trenton, NJ), “Good Humor,” pg. B1, col. 1:
“What happens to illegally parked frog?”
“They get toad away.”
   
Google Books
The Big Book of Silly Riddles
By Gyles Brandreth
New York, NY: Sterling Publishing Company, Incorporated
1988
Pg. 74:
Did you hear about the frog that parked his car illegally? It got toad away.
 
Google Books
Whisperin’ Bill:
An Autobiography
By Bill Anderson
Marietta, GA: Longstreet Press
1989
Pg. 427:
“Hey, Bill, did you hear about the frog that got caught in the illegal parking zone?”
 
“No, I didn’t, Edgar. What happened?”
 
“He got toad away!”
 
Google Books
April 1990, Boys’ Life, “Think & Grin,” pg. 72, col. 3:
Duff: Say, Dink, do you know what happens to frogs left in a no-parking zone?
Dink: Tell me.
Duff: They get toad away! — Fat Juenemann, Clements, Minn
   
Google Groups: rec.humor
Canonical List Of Language Expressions Humor 3/4
Stuffed Turkey
11/23/93
(...)
What happens to illegally parked frogs?  They get toad away.
   
17 June 1995, Sun Sentinel (Fort Lauderdale, FL), Robert McClure column, pg. 1D:
As you pull up, you may notice another sign, this one decorated by a little frog:
Illegally parked cars get TOAD away.
 
Google Books
The Little Giant Book of Jokes
By Joseph Rosenbloom
New York, NY: Sterling Publishing Company, Inc.
1996
Pg. 191:
Did you hear about the frog who parked his car illegally?
It got toad away.
 
24 August 1998, The Sun (London, UK), “Sun fun,” pg. 20:
WHAT happens to frogs who break down?
They get toad away.
 
Free Funny Jokes
Funny Car And Train Jokes
Posted on November 24th, 2008 Funny Joker
(...)
Car And Train Joke 64
What happens when a frog’s car breaks down? It gets toad away..
 
Google Books
The Mammoth Book of Jokes 2
By Geoff Tibballs
London, UK: Constable & Robinson Ltd
2012
Pg. ?:
Did you hear about the frog that broke down? – He got toad away.
 
Reddit—Jokes
What happens when frogs park illegally?
submitted August 14, 2017 by archiekc
They get toad.