What does the idiom "to have a frog in one's throat" mean?

To have difficulty speaking or a hoarse voice due to throat irritation

What does the expression "a snake in the grass" refer to?

A dangerous and deceitful person who hides their true intentions.

What is the meaning of the idiom "to smell a rat"?

To suspect that something is wrong or suspicious

What does the expression "to have a whale of a time" mean?

If someone "has a bee in their bonnet," what are they likely experiencing?

An obsessive preoccupation with an idea or concern