In Danish, they are called »legoklodser« (i.e. Lego bricks); seldom is the word capitalised.
PS: I had the pleasure of having eusocial Danish neighbors growing up. The guy worked for Spectra-Physics as a laser technician and drove a Wankel '81 Mazda RX-7 that I could hear revving away towards work every morning.
Stipulative definitions since meanings of words vary from person-to-person:
"Eusocial" to me means "prone to socializing".
"Prosocial" to me means "aware of the interests of the group and seeks to positive contributions to the groups and individuals."
"Asocial" to me means "neural or indifferent towards others."
"Antisocial" to me has multiple meanings either "avoids people", "doesn't get along with people", or "is indifferent to or against the interests of others".