Answer:
Though I am only two words I have thousands of letters in me
I travel in a gaggle.
I live off of a busy street if you want you can stay for an hour or two but if you don't pay rent I'll tell on you.
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
When I am caught I am thrown away. When I escape you itch all day.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic