Just found solution here: Inline conditional for variable's existence
Thks @davidsneighbour too
{{- $socials := .Site.Params.social_item -}}
{{- if eq $.Type "te" }}
{{ $socials = .Site.Params.social_item_te }}
{{ else }}
{{ $socials = .Site.Params.social_item }}
{{ end -}}
{{- range $socials }}
{{- if .link -}}
<a title="{{- .title -}}" href="{{- .link -}}" target="_blank" rel="noopener"><span class="icon-round themeicon themeicon-{{ .icon }}"></span></a>
{{- end -}}
{{ end -}}