der Trupp
squad
A small, organized group of people carrying out a common task, especially in a military, police, or technical context.
Ein Trupp Soldaten sicherte das Gelände.
A squad of soldiers secured the area.

squad / group
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squad
A small, organized group of people carrying out a common task, especially in a military, police, or technical context.
Ein Trupp Soldaten sicherte das Gelände.
A squad of soldiers secured the area.

In its main meaning, 'Trupp' is often combined with professional or functional groups that perform a task. Typical examples are 'ein Bautrupp' (a construction crew), 'ein Rettungstrupp' (a rescue team), or 'ein Fernsehtrupp' (a TV crew).
Ein Bautrupp repariert die Straße vor unserem Haus.
A construction crew is repairing the road in front of our house.
This meaning almost always refers to a small, organized group with a clear, often professional mission. The context is usually military or technical, or it relates to rescue services.
Der Polizist forderte einen Trupp zur Verstärkung an.
The police officer requested a squad as backup.
In this meaning, 'Trupp' is used colloquially to describe any small group of people. It often has a slightly casual or humorous tone.
Was für ein lustiger Trupp ihr doch seid!
What a funny group you all are!
group
'die Gruppe' and 'der Trupp' both refer to several people who are together or doing something together. 'die Gruppe' is neutral and very general. 'der Trupp' is usually smaller and sounds more active: the people are out together or carrying out a specific task. You often hear the word in military, police, or technical contexts, but colloquially it can also refer to friends. Learners may confuse the words because both describe a small number of people. 'Trupp' fits especially well when the shared action is the main focus.

Ein Trupp von Technikern repariert morgen die Leitung.
A crew of technicians will repair the line tomorrow.
Am Wochenende ist der Mitarbeiter Teil einer freiwilligen Gruppe im Stadtteil.
At the weekend, the employee is part of a volunteer group in the neighborhood.