Deaf person here and attended that high school. I was surprised to see my high school in the news.
The team can learn sign language if they prefers or they can use pidgin. Pidgin is a simplified form of the communication to convey it. Pidgin itself is not a language, it is more of jargon in a sense. Pidgin is very common uses outside of Deaf communities.
Baseball use call signs, and that is pidgin. Crane operators have their hand signs, that is pidgin too! Same for military, they use pidgin. Pidgin is easier to learn than sign language as it can be simple handshape or call sign, similarly to emoji in a way. Sign language requires efforts and you will be surprised to find thousand muscles you never thought you used before.
Is that technically pidgin? I thought pidgin was a simplified version of language used expressly for communication between speakers that don't understand each other. Is it still pidgin if neither one understands full sign language?
If the Deaf team are using sign language to communicate with each other, then no it is not pidgin because American Sign Language is a language. Pidgin is a lingua franca like Gestuno (International Sign) and Esperanto.
EDIT: If you are talking about Deaf Team and Hearing Team (people with hearing ability for those folk who are not familiar with Deaf communities jargon) attempt to communicate with each other without sign language, then yes it can be a pidgin. If the Deaf Team itself communicating with their teammates, then it is not a pidgin because they switch to their native language to express.
As far as I understand, Esperanto would not be considered a pidgin as it's an artificial, designed language. Pidgins are natural languages that form in order to facilitate communication in multilingual environments.
The team can learn sign language if they prefers or they can use pidgin. Pidgin is a simplified form of the communication to convey it. Pidgin itself is not a language, it is more of jargon in a sense. Pidgin is very common uses outside of Deaf communities.
Baseball use call signs, and that is pidgin. Crane operators have their hand signs, that is pidgin too! Same for military, they use pidgin. Pidgin is easier to learn than sign language as it can be simple handshape or call sign, similarly to emoji in a way. Sign language requires efforts and you will be surprised to find thousand muscles you never thought you used before.