Scalls are not a real word in English. Maybe you mean 'scales', like the things on a fish, or 'calls', like when you talk to someone on the phone.
If you talk about 'scales', it's usually about fish or maybe music. If you talk about 'calls', it's usually about talking to someone on the phone.
Examples:
The fish has shiny scales.
She calls her friend every day.
He plays music on the scales.
The fish with scales is very pretty.
She makes a lot of calls every day.
The scales on the fish are like armor.