I have the feeling that the Goblin "Dodge as a Bonus Action without cost" feature is overpowered.
If you calculate an average human 5th level warrior with standard array, (16 str, 13 deg, 16 con with chain shirt, shield, longsword, Dueling, 43hp),
opposed to a similar goblin (16 str, 14 deg, 14 con, 32hp, same armor but only short sword)
the Goblin has a probability to hit the human of 55%, while the human in return has only 25% due to this Dodge feature.
The result is that the human gets killed almost all the time if you roll dice. Human is killed in 5th round average, goblin 7th round, the difference is huge.
I think this feature overcompensate the d6 hit die and would entice players to play goblins fighters (one should not underestimate the will of players to make the most of rules, especially in 5e systems).
I would rule it should come with a price such as :
- having Disadvantage on your next (or next round) attack roll when you use Dodge as a BA, you are unbalanced by your Dodge.
This is the opposite formulation of 5e Barbarian Reckless attack if you apply full round disadvantage.
- you can use it once every other round as the effort is huge.