frog in one's throat - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Hoarseness or phlegm in the throat, as in Can you understand me? I've got a frog in my throat. This expression probably owes its origin to the froglike croaks produced by a person with a sore throat. [c. 1900]