Certainly! First, there is the relative nature of stalking or hiding in their own culture, where Andres son Midget, standing only 10' 4", is a sneaky rogue well known for his light fingers and sneaky ways.
Hiding rolls for giants would depend a lot on terrain. In larger towns/cities, forest, hill country and mountains, a giant could hide.
Don't forget magic. A giant ranger would have the arsenal of hiding spells all rangers posses. Having had giant PC's, I can tell you their mental and magic stat mods aint even good and they lack the higher skill bonuses of normal spell users. The SL crit makes up for it though. Our mage fire giant was getting knocked out all the time. While one rank in body dev was 25 hits, it still cost him 9 dev.