The point is not that it's a dictionary word but that huddle could be too generic to get as a trademark, that means you can [likely] use it* but also that anyone else offering a group-talk phone app could use it too.
I don't think huddle in the UK would be considered to lack the distinctive quality that makes it suitable to be a RTM but perhaps in the USA?
TM are registered in an area of business, as companies grow they tend to fill [almost] all areas, I'm sure you can get MS clothing, MS food, MS surfboards, ... if huddle isn't registered and can be then registering it is fine but as mentioned it does not prevent current use from being continued IIRC.
* I'm clearly not a TM lawyer and this ain't advice.
I don't think huddle in the UK would be considered to lack the distinctive quality that makes it suitable to be a RTM but perhaps in the USA?
TM are registered in an area of business, as companies grow they tend to fill [almost] all areas, I'm sure you can get MS clothing, MS food, MS surfboards, ... if huddle isn't registered and can be then registering it is fine but as mentioned it does not prevent current use from being continued IIRC.
* I'm clearly not a TM lawyer and this ain't advice.