In the midlands the Freshman Team is called "B-Team". It goes Varsity (high school), Junior Varsity (high school), B Team (usually all Freshmen) and then C-Team (midlle schoolers). Some even flirted with a C-Team (8th graders) and D-Team (7th graders).
I have NEVER heard of a A or AA program having an all-Freshman team(B Team or whatever you want to call it). Usually, numbers are such a problem that most available bodies are used by Varsity and JV only. Sometimes, a A or AA JV team is mostly Frehsmen, but that is because all the Soph, Jrs and Srs are needed for Varsity.
Numerous AAA and most AAAA programs DO have Freshmen teams, though.
Hope this helps.