Fallout 3 and Fallout 76 Trogs

Here is a group of a Trog Brute from Fallout 3 The Pitt and two Trog Fledglings and one Trog from Fallout 76 Expeditions: The Pitt

In Fallout 3 there are four different types of Trogs, Trog Fledgling, Trog, Trog Brute, and Trog Savage. But they all look the same, except the Trog Fledging is smaller.

In Fallout 76 there are six different types of Trogs, Trog Fledgling, Trog, Trog Devourer, Trog Striker, Trog Superior, and Glowing Trog. Trog Fledglings has some green on them, Trogs look like the Trogs from Fallout 3, Trog Devourer, Trog Striker, and Trog Superior are bigger and have some black them, and Glowing Trog are glowing green after became highly irradiated.

Fallout 3: Game of the Year Edition © Bethesda Softworks and Bethesda Game Studios
Screenshot taken from Fallout 3 The Pitt on XBOX ONE thanks to the backwards compatibility.