Provided they can be placed within 3" of their concealing unit and not touching the bases of any other models, yes.
Source: Warhammer: The Old World Online Rules Index
Orc & Goblin Tribes - Frequently Asked QuestionsURL Copied!
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View complete list of all frequently asked questions.
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If a unit of Night Goblins that is engaged in combat still contains any unreleased Fanatics, can they be released whilst the unit is engaged?URL Copied!
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Source: Official Ravening Hordes FAQ & Errata - Version 1.0
If a Fanatic moves into contact with a unit that's engaged in combat, does it hit the unit(s) that unit is engaged with as well?URL Copied!
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When a Fanatic moves into contact with another unit, it continues in a straight line until it can be placed back on the battlefield. Any units that line passes through are hit. Units the line does not pass through are not hit.
Source: Official Ravening Hordes FAQ & Errata - Version 1.0
All Goblins Fear Elves. If a unit of Elves causes Fear, does this lead them to cause Terror in Goblins?URL Copied!
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No.
Source: Official Ravening Hordes FAQ & Errata - Version 1.0