From Teflpedia

Thrive is an uncommon English verb.

Thrive is a lexical verb. It is an ambiregular verb. It has the base form "thrive", the third person form "thrives", and a regular preterite and past participle "thrived". However, it also has an alternative, irregular preterite "throve" and an alternative irregular past participle "thriven". Generally speaking, the regular form seems to be preferred.

Pronunciation: EFL learners may struggle with the unvoiced dental fricative "th", especially followed by a /r/ sound.