Have a frog in your throat - Idioms by The Free Dictionary
have a frog in your throat
have a frog in (one's) throat
To feel as though something is caught or stuck in one's throat. Can refer to actual hoarseness or the inability to speak due to fear. I have such a frog in my throat from this cold that I can barely talk! Elise couldn't say a word in the meeting and looked completely terrified. She must have had a frog in her throat.
have a frog in your throat lose your voice or find it hard to speak because of hoarseness or an apparent impediment in your throat. informal
have a ˈfrog in your throat (informal) not be able to speak clearly because your throat is sore, you want to cough, etc: She had a frog in her throat, so she had a drink of water before she went on speaking.