Been researching their ships, according to Tacitus boats like the Hjorstpring one were still in use by the Suiones centuries after that find.
They will probably be a very weak civ navally, first find of a larger boat is the one bellow from the 4th century (Based on what i read in previous posts, it seems the civ's timeframe ends after the Marcomannic wars in the late 2nd century).
,
There are a couple accounts of north sea tribes raiding in rivers or by sea but the accounts just mention boats without much specifics.
Some possible names Fiskarijaz Baitaz (Fishing ship) Kauponabaitaz (Trade ship), Skipa (Light war ship).
The first post says that units will have tribal names, possible tribes for a warship would be Suardones, Angles and Chauci (Last two are not exactly Suebian but sometimes joined them in wars).