Air carrier pilot reported during taxi on the ramp they observed a critical ground conflict between two aircraft; one of which was not communicating with ramp control. Pilot reported someone on frequency yelled to the aircraft telling them to stop and collision was avoided.

Narrative

ZZZ - East Ramp Day 0. We had just been given a taxi clearance to XX from east ramp; as we had just pushed from gate XY. I immediately noticed a sense of urgency in the ramp controllers voice as they began looking for an aircraft that was not responding to radio calls. There was a long line of aircraft taxing from the north ramp down towards spots XZ; as well as a line of aircraft taxing from south ramp near spot XA and XX towards XB. ZZZ was operating in a south flow with our departure runway being XXL. A B737 was at a stop on XX; facing Eastbound; an E175 was slowly taxiing; facing west; just past the ramp hold short line on 1 near spot XB. It became very clear that the ramp was trying to contact that E175 with no avail. As we started listening to ATC on Ground freq; they were talking to this aircraft; who was obviously very lost and unsure what to do. As Ground gave them instructions to move out of the way because the entire ramp was locked up because of them; the E175 crew finally called ramp. Ramp then asked them to slide over out of the way for the 737 to pass as they effectively had locked the ramp up. To which they turned north on the orange line toward XZ. Then ramp now cleared the 737 to spot XB and Ground Control. Ground cleared the 737 to taxi to Runway XXL via 1 and 2. At this point the ramp area became very confusing and unsafe. For some reason; as the 737 began its roll past spot XB; towards taxiway 1 the E175 continued a clockwise turn toward XB as well and began taxing toward the hold short line for 1. At this point both the 737 and the E175 were within seconds of clipping wings when someone started yelling Stop; Stop" on one of the frequencies. Either XXX.X or XXX.XY I am not sure which. The E175 finally stopped; which kept a taxiway incursion from happening. The crew of the 175 was clearly situationally lost. They had no clue where they were; who to talk to or where to go. They almost hit another aircraft in the process. Rather than coming to a complete stop and admitting they needed help and gain a better understanding of where they were and where they needed go; they just kept moving; putting others at risk until another pilot shouted over the radio to stop.This E175 flight was an outbound flight. How they ended up facing west; at spot XB for an outbound flight on Runway XXL is a mystery to me as it happened prior to us turning into visual contact for our taxi. But they created a hazardous environment for many other aircraft by not just stopping for clarification.ZZZ ramp remains a difficult area. However this crew seemed ignorant to the risk they created. Loosing SA on a busy day in ZZZ can create huge chances for incursions in a tight space. Ground should have refused to give them any directions once on the ramp; besides a frequency to contact. Ramp should have not given any taxi clearances to any single aircraft knowing that crew was in taxi distress. But ultimately the responsibility fell on this crew for not setting the brake until they were clear on what they needed to do."