How about squeeze or scooch by?

Part of it may depend on just how entrenched they are and the degree of inconvenience. If they have to step out of the way, you may want to ask. Do you mind if I get by? Can I get by you? Can I get through here? If the way is mostly clear, and they barely have to move at all, it might suffice just to say: Pardon me Pardon Excuse me (tone of voice is important here).

In situations where there's a crowd of people and you need to pass through, you can use polite and respectful language to ask for permission. Here are a few ways to do so: "Excuse me, may I pass through?" "Could I please get through?" "Pardon me, is it possible for me to go through?" "Sorry to bother you, but could I go by?" "Excuse me, would it be okay if I passed through?" It's important to maintain a friendly and courteous tone when asking, and be sure to make eye contact and wait for a response before attempting to move through the crowd. People generally appreciate polite requests and are likely to accommodate your needs if you ask nicely.

I would just say "Excuse me, please." The rest is not needed. Your body language says that you want to pass by.