Lewis & Short

follĭco, no perf., ātum, 1, v. n. [follis], to expand and contract one’s self like a pair of bellows (post-Aug. and rare): animalia follicent, Veg. Vet. 5, 75, 1.
Usu. in the part. praes.: muli senesfollicantes nares languidas, App. M. 9, p. 222: chamaeleon oscitans vescitur, follicans ruminat, Tert. Pall. 3: laxae manicae, caligae follicantes, loose, Hier. Ep. 22, 34.